256700555831 has 16 divisors (see below), whose sum is σ = 259738402560. Its totient is φ = 253682107200.

The previous prime is 256700555809. The next prime is 256700555843. The reversal of 256700555831 is 138555007652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256700555831 - 2²⁶ = 256633446967 is a prime.

It is a super-2 number, since 2×256700555831² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256700555231) 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, 68106515 + ... + 68110283.

It is an arithmetic number, because the mean of its divisors is an integer number (16233650160).

Almost surely, 2^256700555831 is an apocalyptic number.

256700555831 is a deficient number, since it is larger than the sum of its proper divisors (3037846729).

256700555831 is a wasteful number, since it uses less digits than its factorization.

256700555831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6134.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 256700555831 in words is "two hundred fifty-six billion, seven hundred million, five hundred fifty-five thousand, eight hundred thirty-one".