55

55 (fifty-five) is a positive integer following 54 and preceding 56. Its ordinal form is written "fifty-fifth" or 55th.
== Properties ==
*55 is an .
*55 is the 10th , and therefore the number of tiles in a double-nine set.
*55 is a repdigit number.
== Approximations ==
Notation 	Approximation
Copy notation	5[2] (exact)
== In googology ==
*In Greek-based number-naming systems, 55 is associated with prefix "pentapentaconta-", and with prefix "quinquinquaginti-" in Latin systems.
*SuperJedi224 coined the name Fibonax for this number.Naming Large Fibonacci Numbers
*André Joyce has given the name "rootbeer" for this number.http://michaelhalm.tripod.com/id76.html
== See also ==
*fifty-fives
== Sources ==
Category:Numbers
Category:Class 1
Category:Domino-related numbers
Category:Fibonacci numbers
Category:Numbers 0-99
Category:Numbers with 1 to 2 digits
Category:Odd numbers
Category:Repdigit numbers