256542708968 has 32 divisors (see below), whose sum is σ = 592021637760. Its totient is φ = 101489423040.

The previous prime is 256542708959. The next prime is 256542708997. The reversal of 256542708968 is 869807245652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256542708968.

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, 176196188 + ... + 176197643.

It is an arithmetic number, because the mean of its divisors is an integer number (18500676180).

Almost surely, 2^256542708968 is an apocalyptic number.

256542708968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256542708968 is an abundant number, since it is smaller than the sum of its proper divisors (335478928792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256542708968 is a wasteful number, since it uses less digits than its factorization.

256542708968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352393857 (or 352393853 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 256542708968 in words is "two hundred fifty-six billion, five hundred forty-two million, seven hundred eight thousand, nine hundred sixty-eight".