256618873126731 has 16 divisors (see below), whose sum is σ = 349465259303424. Its totient is φ = 167426426054304.

The previous prime is 256618873126699. The next prime is 256618873126753. The reversal of 256618873126731 is 137621378816652.

It is not a de Polignac number, because 256618873126731 - 2⁵ = 256618873126699 is a prime.

It is a super-2 number, since 2×256618873126731² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256618873121731) 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, 67929856 + ... + 71607981.

It is an arithmetic number, because the mean of its divisors is an integer number (21841578706464).

Almost surely, 2^{256618873126731} is an apocalyptic number.

256618873126731 is a deficient number, since it is larger than the sum of its proper divisors (92846386176693).

256618873126731 is a wasteful number, since it uses less digits than its factorization.

256618873126731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139550930.

The product of its digits is 121927680, while the sum is 66.

The spelling of 256618873126731 in words is "two hundred fifty-six trillion, six hundred eighteen billion, eight hundred seventy-three million, one hundred twenty-six thousand, seven hundred thirty-one".