256557183 has 16 divisors (see below), whose sum is σ = 364212576. Its totient is φ = 160081920.

The previous prime is 256557181. The next prime is 256557199. The reversal of 256557183 is 381755652.

It is not a de Polignac number, because 256557183 - 2¹ = 256557181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256557181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4666 + ... + 23127.

It is an arithmetic number, because the mean of its divisors is an integer number (22763286).

Almost surely, 2^256557183 is an apocalyptic number.

256557183 is a deficient number, since it is larger than the sum of its proper divisors (107655393).

256557183 is a wasteful number, since it uses less digits than its factorization.

256557183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27994.

The product of its digits is 252000, while the sum is 42.

The square root of 256557183 is about 16017.4025047759. The cubic root of 256557183 is about 635.4207499389.

The spelling of 256557183 in words is "two hundred fifty-six million, five hundred fifty-seven thousand, one hundred eighty-three".