256581185308 has 12 divisors (see below), whose sum is σ = 513162370672. Its totient is φ = 109963365120.

The previous prime is 256581185257. The next prime is 256581185327. The reversal of 256581185308 is 803581185652.

256581185308 is an admirable number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4581806853 + ... + 4581806908.

Almost surely, 2^256581185308 is an apocalyptic number.

256581185308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256581185308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256581185308 is a wasteful number, since it uses less digits than its factorization.

256581185308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9163613772 (or 9163613770 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 256581185308 in words is "two hundred fifty-six billion, five hundred eighty-one million, one hundred eighty-five thousand, three hundred eight".