266 (number)

← 265 266 267 →
← 260 261 262 263 264 265 266 267 268 269 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred sixty-six
Ordinal	266th; (two hundred sixty-sixth)
Factorization	2 × 7 × 19
Divisors	1, 2, 7, 14, 19, 38, 133, 266
Greek numeral	ΣΞϚ´
Roman numeral	CCLXVI, cclxvi
Binary	1000010102
Ternary	1002123
Senary	11226
Octal	4128
Duodecimal	1A212
Hexadecimal	10A16

Last updated December 25, 2025

266 (two hundred [and] sixty-six) is the natural number following 265 and preceding 267.

In mathematics

266 is an even composite number with three prime factors.^[1]
266 is a repdigit in base 11. In base 11, 266 is 222.
266 is a sphenic number being the product of 3 prime numbers.^[2]
266 is a nontotient number which is an even number not in Euler’s totient function.^[3]
266 is an inconsummate number.^[4]

References

↑ "Facts about the integer". Wolfram MathWorld.
↑ "Sphenic numbers". Wolfram MathWorld.
↑ "Nontotient numbers". Wolfram MathWorld.
↑ "Inconsummate numbers". oeis.org.

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[1] "Facts about the integer". Wolfram MathWorld.

[2] "Sphenic numbers". Wolfram MathWorld.

[3] "Nontotient numbers". Wolfram MathWorld.

[4] "Inconsummate numbers". oeis.org.

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