256268665 has 16 divisors (see below), whose sum is σ = 311875200. Its totient is φ = 202129920.

The previous prime is 256268651. The next prime is 256268671. The reversal of 256268665 is 566862652.

It is not a de Polignac number, because 256268665 - 2⁹ = 256268153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149986 + ... + 151684.

It is an arithmetic number, because the mean of its divisors is an integer number (19492200).

Almost surely, 2^256268665 is an apocalyptic number.

It is an amenable number.

256268665 is a deficient number, since it is larger than the sum of its proper divisors (55606535).

256268665 is a wasteful number, since it uses less digits than its factorization.

256268665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112.

The product of its digits is 1036800, while the sum is 46.

The square root of 256268665 is about 16008.3935796194. The cubic root of 256268665 is about 635.1824676612.

The spelling of 256268665 in words is "two hundred fifty-six million, two hundred sixty-eight thousand, six hundred sixty-five".