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18 (eighteen) is a positive integer following 17 and preceding 19. Its ordinal form is written "18th" or "eighteenth".

Properties Edit

18 is an even composite number.

18 is a solitary number.

In googology Edit

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 Edit

Since it is also the age of majority in most countries, it is associated with adult-only media. It is one of few non-single-digit numbers that has its own emoji: 🔞

18-0