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Six (6) is the natural number following five and preceding seven.

Six is the second smallest composite number, its proper divisors being 1, 2 and 3. Since six equals the sum of these proper divisors, six is a perfect number. The next perfect number is 28. Six is also a highly composite number. The next highly composite number is twelve.

The smallest non-abelian group is the symmetric group S3 which has 3 = 6 elements.

In binary code six is 110; in ternary code six is 20; in quaternary numeral system code six is 12; in quinary six is 11; in senary six is 10; in septenary code and all codes above (such as octal, decimal and hexadecimal) six is 6. In Roman numerals six is VI.

Hexa is Greek for "six". As such:

The prefix "hexa-" also occurs in the systematic name of many chemical compounds, such as "hexamethyl".

A group of six musicians is called a sextet. Six babies delivered in one birth are sextuplets. The first set of sextuplets of whom all six survived are the Dilley Sexuplets. People with sexdactyly have six fingers on each hand. A sextant got its name because its shape forms one sixth of a whole circle.

Other things that come in six:

See also: four, five, six, seven, eight, integer, list of numbers.

This article is about the number. For the year AD 6, see 6.

Preceded by:
Integers Succeeded by: