256665260 has 12 divisors (see below), whose sum is σ = 538997088. Its totient is φ = 102666096.

The previous prime is 256665229. The next prime is 256665271. The reversal of 256665260 is 62566652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6416612 + ... + 6416651.

It is an arithmetic number, because the mean of its divisors is an integer number (44916424).

Almost surely, 2^256665260 is an apocalyptic number.

256665260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256665260 is an abundant number, since it is smaller than the sum of its proper divisors (282331828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256665260 is a wasteful number, since it uses less digits than its factorization.

256665260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12833272 (or 12833270 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 256665260 is about 16020.7758863296. The cubic root of 256665260 is about 635.5099629643.

The spelling of 256665260 in words is "two hundred fifty-six million, six hundred sixty-five thousand, two hundred sixty".