256677745331 has 64 divisors (see below), whose sum is σ = 307257753600. Its totient is φ = 209925181440.

The previous prime is 256677745321. The next prime is 256677745349. The reversal of 256677745331 is 133547776652.

It is not a de Polignac number, because 256677745331 - 2¹⁸ = 256677483187 is a prime.

It is a super-2 number, since 2×256677745331² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256677745321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 735466145 + ... + 735466493.

It is an arithmetic number, because the mean of its divisors is an integer number (4800902400).

Almost surely, 2^256677745331 is an apocalyptic number.

256677745331 is a deficient number, since it is larger than the sum of its proper divisors (50580008269).

256677745331 is a wasteful number, since it uses less digits than its factorization.

256677745331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its digits is 22226400, while the sum is 56.

The spelling of 256677745331 in words is "two hundred fifty-six billion, six hundred seventy-seven million, seven hundred forty-five thousand, three hundred thirty-one".