256831138652 has 24 divisors (see below), whose sum is σ = 492348510192. Its totient is φ = 116257017600.

The previous prime is 256831138649. The next prime is 256831138679.

256831138652 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 256831138652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12099503 + ... + 12120710.

It is an arithmetic number, because the mean of its divisors is an integer number (20514521258).

Almost surely, 2^256831138652 is an apocalyptic number.

256831138652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256831138652 is a deficient number, since it is larger than the sum of its proper divisors (235517371540).

256831138652 is a wasteful number, since it uses less digits than its factorization.

256831138652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24220469 (or 24220467 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The spelling of 256831138652 in words is "two hundred fifty-six billion, eight hundred thirty-one million, one hundred thirty-eight thousand, six hundred fifty-two".