256521056132140 has 48 divisors (see below), whose sum is σ = 542341815966720. Its totient is φ = 101915865169920.

The previous prime is 256521056132111. The next prime is 256521056132213. The reversal of 256521056132140 is 41231650125652.

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, 67631925 + ... + 71324044.

It is an arithmetic number, because the mean of its divisors is an integer number (11298787832640).

Almost surely, 2^{256521056132140} is an apocalyptic number.

256521056132140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256521056132140 is an abundant number, since it is smaller than the sum of its proper divisors (285820759834580).

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

256521056132140 is a wasteful number, since it uses less digits than its factorization.

256521056132140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138956602 (or 138956600 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 256521056132140 in words is "two hundred fifty-six trillion, five hundred twenty-one billion, fifty-six million, one hundred thirty-two thousand, one hundred forty".