The number 6. It comes after five and before seven.

Ordinal: sixth. Common collocations: six-pack, at sixes and sevens (confused/disorganised), sixth sense. Note: the plural ordinal is 'sixths' — for example, 'five-sixths of the class passed'.

'At sixes and sevens' is an English idiom meaning in a state of confusion or disarray. A 'six-pack' refers both to six cans of drink sold together and to well-defined abdominal muscles. 'Six degrees of separation' is the idea that everyone in the world is connected through six people.