256004665 has 48 divisors (see below), whose sum is σ = 379275264. Its totient is φ = 165110400.

The previous prime is 256004653. The next prime is 256004711. The reversal of 256004665 is 566400652.

It is not a de Polignac number, because 256004665 - 2⁵ = 256004633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256004665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280560 + ... + 281470.

It is an arithmetic number, because the mean of its divisors is an integer number (7901568).

Almost surely, 2^256004665 is an apocalyptic number.

It is an amenable number.

256004665 is a deficient number, since it is larger than the sum of its proper divisors (123270599).

256004665 is a wasteful number, since it uses less digits than its factorization.

256004665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 256004665 is about 16000.1457805859. The cubic root of 256004665 is about 634.9642776523.

The spelling of 256004665 in words is "two hundred fifty-six million, four thousand, six hundred sixty-five".