256717456539560 has 128 divisors (see below), whose sum is σ = 587196757002240. Its totient is φ = 101000884358400.

The previous prime is 256717456539529. The next prime is 256717456539587. The reversal of 256717456539560 is 65935654717652.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303230045 + ... + 304075475.

It is an arithmetic number, because the mean of its divisors is an integer number (4587474664080).

Almost surely, 2^{256717456539560} is an apocalyptic number.

256717456539560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256717456539560 is an abundant number, since it is smaller than the sum of its proper divisors (330479300462680).

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

256717456539560 is a wasteful number, since it uses less digits than its factorization.

256717456539560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846087 (or 846083 counting only the distinct ones).

The product of its (nonzero) digits is 1428840000, while the sum is 71.

The spelling of 256717456539560 in words is "two hundred fifty-six trillion, seven hundred seventeen billion, four hundred fifty-six million, five hundred thirty-nine thousand, five hundred sixty".