18

18 (eighteen) is a positive integer following 17 and preceding 19. Its ordinal form is written "18th" or "eighteenth".
== Properties ==
*18 is an OEIS, sequence A002808 (accessed 2020-11-13).
*18 is a .
*18 is the number for the French department of Cher.
== In googology ==
In Greek-based number-naming systems, 18 is associated with prefix "octadeka-", and with prefix "octodeci-" in Latin systems. In the Misalian seximal system, this number is called "thirsy", because it's three times six.
== Cultural significance ==
Since it is also the in most countries, it is associated with and the age of consent in much of America. It is one of few non-single-digit numbers that has its own : 🔞
==See also==
*Quintillion, 1018 using the short scale
==Sources==
Category:Numbers
Category:Class 1
Category:Non-powers
Category:Numbers 0-99
Category:Numbers with 1 to 2 digits
 
zh:十八