Googology Wiki
Googology Wiki

99 (ninety-nine) is a positive integer following 98 and preceding 100. Its ordinal form is written "ninety-ninth" or 99th.


99 is an odd composite number.

99 is a repdigit number. (Its factors are 1, 3, 9, 11, 33, and 99)

99 is a palindrone.

if you flip 99 upside down it becomes 66

99 is the largest two-digit positive integer.

In googology

In Greek-based number-naming systems, 99 is associated with prefix "enneaenneaconta-", and with prefix "novemnonaginti-" in Latin systems.

Loader.c is based on 99, because 99 was the largest integer that could respect the 512-character limit.

Cultural significance

As it is one less than 100, it is often used as a price, or as a part of a price. It is also used in the song 99 Luftballons by Nena.

See also