Six

← 5 6 7 →
−1 0 1 2 3 4 5 6 7 8 9 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	six
Ordinal	6th (sixth)
Numeral system	senary
Factorization	2 × 3
Divisors	1, 2, 3, 6
Roman numeral	VI
Roman numeral (unicode)	Ⅵ, ⅵ, ↅ
Greek prefix	/
Latin prefix	/
Binary	1102
Ternary	203
Quaternary	124
Quinary	115
Senary	106
Octal	68
Duodecimal	612
Hexadecimal	616
Vigesimal	620
Base 36	636
Greek	στ (or ΣΤ or ς)
Arabic & Kurdish	٦
Persian	۶
Urdu
Amharic	፮
Bengali	৬
Chinese numeral	六，陆
Devanāgarī	६
Hebrew	ו (Vav)
Khmer	៦
Thai	๖
Telugu	౬
Tamil	௬
Saraiki	٦

6 (six /ˈsɪxs/) is the natural number following 5 and preceding 7.

The SI prefix for 1000⁶ is exa- (E), and for its reciprocal atto- (a).

6 is the smallest positive integer which is neither a square number nor a prime number. Six is the second smallest composite number; its proper divisors are 1, 2 and 3.

Since six equals the sum of its proper divisors, six is the smallest perfect number, Granville number, and ${\displaystyle {\mathcal {S}}}$-perfect number.

As a perfect number:

Six is the only number that is both the sum and the product of three consecutive positive numbers.

Unrelated to 6 being a perfect number, a Golomb ruler of length 6 is a "perfect ruler." Six is a congruent number.

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Wikipedia