25

25 (twenty-five) is a positive integer following 24 and preceding 26. Its ordinal form is written "25th" or "twenty-fifth".
== Properties ==
*25 is an number.
*25 is the 5th OEIS, Sequence A000290.
*The 25th of December is known around the world as Christmas Day.
*25 is the result of the Pythagorean triple 32+42 or 9+16=25.
*Its prime factorization is 25 = 5².
*25 is the first Friedman number.
== Counting to 25 using fingers ==
It is possible to extend standard counting system so that it can count up to 25. The matter is that when we bend the first five fingers on one hand, we bend one on another hand and unbend all on the first. Extension of this method can be used to count all the way to 1,023, using powers of 2.
== In googology ==
*In Greek-based number-naming systems, 25 is associated with the prefix "pentaicosa-", and with the prefix "quinviginti-" in Latin systems.
*It can be named garfive with the gar- prefix.
== As a cash denomination ==
Some currencies, such as the and the , have banknotes with this number in the denomination.
Some currencies, such as the and the , have coins with this number in the denomination.
==Sources==
Category:Numbers
Category:Banknote denominations
Category:Coin denominations
Category:Class 1
Category:Numbers 0-99
Category:Numbers with 1 to 2 digits
Category:Powers of 5
Category:Gar-