256039571172 has 48 divisors (see below), whose sum is σ = 744842391552. Its totient is φ = 66503784480.

The previous prime is 256039571171. The next prime is 256039571209. The reversal of 256039571172 is 271175930652.

It is not an unprimeable number, because it can be changed into a prime (256039571171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138548628 + ... + 138550475.

It is an arithmetic number, because the mean of its divisors is an integer number (15517549824).

Almost surely, 2^256039571172 is an apocalyptic number.

256039571172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256039571172 is an abundant number, since it is smaller than the sum of its proper divisors (488802820380).

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

256039571172 is a wasteful number, since it uses less digits than its factorization.

256039571172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277099128 (or 277099126 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 48.

The spelling of 256039571172 in words is "two hundred fifty-six billion, thirty-nine million, five hundred seventy-one thousand, one hundred seventy-two".