256542708966 has 32 divisors (see below), whose sum is σ = 517009903488. Its totient is φ = 84860589120.

The previous prime is 256542708959. The next prime is 256542708997. The reversal of 256542708966 is 669807245652.

It is a happy number.

It is a super-2 number, since 2×256542708966² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2382921 + ... + 2488251.

It is an arithmetic number, because the mean of its divisors is an integer number (16156559484).

Almost surely, 2^256542708966 is an apocalyptic number.

256542708966 is an abundant number, since it is smaller than the sum of its proper divisors (260467194522).

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

256542708966 is a wasteful number, since it uses less digits than its factorization.

256542708966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108436.

The product of its (nonzero) digits is 43545600, while the sum is 60.

The spelling of 256542708966 in words is "two hundred fifty-six billion, five hundred forty-two million, seven hundred eight thousand, nine hundred sixty-six".