Googolplex

A **googolplex** (also called a **maximusgoogol**, a **hundredplexplex**, or a **decaduotrigintillionplex**) is a large number equal to 1010100 = 10googol, or one followed by a googol (10100) zeroes.[​1]​​ Milton Sirotta originally defined it as "one, followed by writing zeroes until you get tired". Edward Kasner, unsatisfied by this vague definition, redefined it to its current value. [​2]​​[​3]​ It is slightly bigger than a duotrigintillionplex. (101099)

Contrary to popular belief, googolplex is neither the largest number nor the largest named number. It is easily beaten by other named numbers such as giggol. In the decimal notation it's written out as

​

10100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

​

Writing down the full decimal expansion would take 1094 books of 400 pages, with 2,500 digits on each page (except for the first, which would have 2,501).

Ten to the power of googolplex is called googolduplex (also called googolplexplex, googolplusplex, and googolplexian).

## Etymology

The name of this number is derived from googol, but there is no logic to the definition otherwise. Googologists later took this number and backformed an etymology by considering "-plex" to be a new suffix.

## Names in -illion systems

In the short scale of the Conway-Wechlser system, it is called

ten trilli-trestrigintatrecentilli(32 times)-duotrigintatrecentillion

According to Landon Curt Noll's The English name of a number, it is also called

ten tremilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliatrecentretriginmilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion
The length of these names can be affected by 10100 not being an even "illion" as an exponent.
For example,in the Epstein system 100000010100 is a *decasexdecillia-illion* (since 10100 is 10 sexdecilliards in long scale).

## In other notations

In Hyper-E notation, it can be written as E100#2 or EE100.

ten duotrigintatrecen-tretrigintatrecentilli-tretrigintatrecenticro-tretrigintatrecentinano-tretrigintatrecentipico-tretrigintatrecentifemto-tretrigintatrecentiatto-tretrigintatrecentizepto-tretrigintatrecentiyocto-tretrigintatrecentixono-tretrigintatrecentiveco-tretrigintatrecentimeco-tretrigintatrecentidueco-tretrigintatrecentitreco-tretrigintatrecentitetreco-tretrigintatrecentipenteco-tretrigintatrecentihexeco-tretrigintatrecentihepteco-tretrigintatrecentiocteco-tretrigintatrecentienneco-tretrigintatrecentiicoso-tretrigintatrecentimeicoso-tretrigintatrecentidueicoso-tretrigintatrecentitrioicoso-tretrigintatrecentitetreicoso-tretrigintatrecentipenteicoso-tretrigintatrecentihexeicoso-tretrigintatrecentihepteicoso-tretrigintatrecentiocteicoso-tretrigintatrecentienneicoso-tretrigintatrecentitriaconto-tretrigintatrecentimetriaconto-tretrigintatrecentiduetriaconto-tretrigintatrecentitriotriacontillion

## More numbers

1. ↑ Googolplex
2. ↑ Googolplex from Wolfram MathWorld
3. ↑ Googol and googolplex
4. ↑ The Conway-Wechsler System​