666265 has 4 divisors (see below), whose sum is σ = 799524. Its totient is φ = 533008.

The previous prime is 666233. The next prime is 666269. The reversal of 666265 is 562666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 458329 + 207936 = 677^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 666265 - 2⁵ = 666233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66622 + ... + 66631.

It is an arithmetic number, because the mean of its divisors is an integer number (199881).

2⁶⁶⁶²⁶⁵ is an apocalyptic number.

It is an amenable number.

666265 is a deficient number, since it is larger than the sum of its proper divisors (133259).

666265 is a wasteful number, since it uses less digits than its factorization.

666265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133258.

The product of its digits is 12960, while the sum is 31.

The square root of 666265 is about 816.2505742724. The cubic root of 666265 is about 87.3404985413.

The spelling of 666265 in words is "six hundred sixty-six thousand, two hundred sixty-five".