256667265 has 32 divisors (see below), whose sum is σ = 456973440. Its totient is φ = 136686528.

The previous prime is 256667239. The next prime is 256667269. The reversal of 256667265 is 562766652.

256667265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256667265 - 2⁸ = 256667009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 256667265.

It is not an unprimeable number, because it can be changed into a prime (256667269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150759 + ... + 152451.

It is an arithmetic number, because the mean of its divisors is an integer number (14280420).

Almost surely, 2^256667265 is an apocalyptic number.

It is an amenable number.

256667265 is a deficient number, since it is larger than the sum of its proper divisors (200306175).

256667265 is a wasteful number, since it uses less digits than its factorization.

256667265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830 (or 2824 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 256667265 is about 16020.8384612042. The cubic root of 256667265 is about 635.5116177710.

The spelling of 256667265 in words is "two hundred fifty-six million, six hundred sixty-seven thousand, two hundred sixty-five".