256265165 has 32 divisors (see below), whose sum is σ = 341126016. Its totient is φ = 183617280.

The previous prime is 256265161. The next prime is 256265183. The reversal of 256265165 is 561562652.

It is a happy number.

It is not a de Polignac number, because 256265165 - 2² = 256265161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256265161) 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, 774050 + ... + 774380.

It is an arithmetic number, because the mean of its divisors is an integer number (10660188).

Almost surely, 2^256265165 is an apocalyptic number.

It is an amenable number.

256265165 is a deficient number, since it is larger than the sum of its proper divisors (84860851).

256265165 is a wasteful number, since it uses less digits than its factorization.

256265165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669.

The product of its digits is 108000, while the sum is 38.

The square root of 256265165 is about 16008.2842615941. The cubic root of 256265165 is about 635.1795759710.

The spelling of 256265165 in words is "two hundred fifty-six million, two hundred sixty-five thousand, one hundred sixty-five".