251450591656 has 16 divisors (see below), whose sum is σ = 514330755840. Its totient is φ = 114295723440.

The previous prime is 251450591647. The next prime is 251450591671. The reversal of 251450591656 is 656195054152.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428696456 + ... + 1428696631.

It is an arithmetic number, because the mean of its divisors is an integer number (32145672240).

Almost surely, 2^251450591656 is an apocalyptic number.

It is an amenable number.

251450591656 is an abundant number, since it is smaller than the sum of its proper divisors (262880164184).

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

251450591656 is a wasteful number, since it uses less digits than its factorization.

251450591656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857393104 (or 2857393100 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 251450591656 in words is "two hundred fifty-one billion, four hundred fifty million, five hundred ninety-one thousand, six hundred fifty-six".