63 (sixty-three) is a positive integer following 62 and preceding 64. Its ordinal form is written "sixty-third" or 63rd.


63 is an odd composite number[1].

In googology

  • In Greek-based number-naming systems, 63 is associated with prefix "triahexaconta-", and with prefix "tresexaginti-" in Latin systems.
  • The Fish numbers are heavily based on the number 63.


  1. OEIS, sequence A002808 (accessed 2020-11-13)
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