256691252504 has 32 divisors (see below), whose sum is σ = 497427315840. Its totient is φ = 124054060800.

The previous prime is 256691252501. The next prime is 256691252507. The reversal of 256691252504 is 405252196652.

It is an interprime number because it is at equal distance from previous prime (256691252501) and next prime (256691252507).

It is a super-2 number, since 2×256691252504² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256691252501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426749 + ... + 833964.

It is an arithmetic number, because the mean of its divisors is an integer number (15544603620).

Almost surely, 2^256691252504 is an apocalyptic number.

It is an amenable number.

256691252504 is a deficient number, since it is larger than the sum of its proper divisors (240736063336).

256691252504 is a wasteful number, since it uses less digits than its factorization.

256691252504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261571 (or 1261567 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 256691252504 in words is "two hundred fifty-six billion, six hundred ninety-one million, two hundred fifty-two thousand, five hundred four".