256565265 has 32 divisors (see below), whose sum is σ = 471398400. Its totient is φ = 117846720.

The previous prime is 256565251. The next prime is 256565279. The reversal of 256565265 is 562565652.

It is an interprime number because it is at equal distance from previous prime (256565251) and next prime (256565279).

It is not a de Polignac number, because 256565265 - 2⁹ = 256564753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37785 + ... + 44054.

It is an arithmetic number, because the mean of its divisors is an integer number (14731200).

Almost surely, 2^256565265 is an apocalyptic number.

It is an amenable number.

256565265 is a deficient number, since it is larger than the sum of its proper divisors (214833135).

256565265 is a wasteful number, since it uses less digits than its factorization.

256565265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81877.

The product of its digits is 540000, while the sum is 42.

The square root of 256565265 is about 16017.6547908862. The cubic root of 256565265 is about 635.4274221572.

The spelling of 256565265 in words is "two hundred fifty-six million, five hundred sixty-five thousand, two hundred sixty-five".