256631147043660 has 72 divisors (see below), whose sum is σ = 812293369786080. Its totient is φ = 65459538955008.

The previous prime is 256631147043553. The next prime is 256631147043763. The reversal of 256631147043660 is 66340741136652.

256631147043660 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 3 + 1 + 147 + 0 + 436 + 60 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 256631147043597 and 256631147043606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30994095745 + ... + 30994104024.

It is an arithmetic number, because the mean of its divisors is an integer number (11281852358140).

Almost surely, 2^{256631147043660} is an apocalyptic number.

256631147043660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256631147043660 is an abundant number, since it is smaller than the sum of its proper divisors (555662222742420).

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

256631147043660 is a wasteful number, since it uses less digits than its factorization.

256631147043660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61988199807 (or 61988199802 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 256631147043660 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, one hundred forty-seven million, forty-three thousand, six hundred sixty".