256562315240 has 64 divisors (see below), whose sum is σ = 719707282560. Its totient is φ = 79967473920.

The previous prime is 256562315237. The next prime is 256562315257. The reversal of 256562315240 is 42513265652.

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, 41646647 + ... + 41652806.

It is an arithmetic number, because the mean of its divisors is an integer number (11245426290).

Almost surely, 2^256562315240 is an apocalyptic number.

256562315240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256562315240 is an abundant number, since it is smaller than the sum of its proper divisors (463144967320).

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

256562315240 is a wasteful number, since it uses less digits than its factorization.

256562315240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83299482 (or 83299478 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 256562315240 in words is "two hundred fifty-six billion, five hundred sixty-two million, three hundred fifteen thousand, two hundred forty".