251939274868 has 12 divisors (see below), whose sum is σ = 460063023840. Its totient is φ = 120492696632.

The previous prime is 251939274817. The next prime is 251939274877. The reversal of 251939274868 is 868472939152.

It is a congruent number.

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, 1369235098 + ... + 1369235281.

It is an arithmetic number, because the mean of its divisors is an integer number (38338585320).

Almost surely, 2^251939274868 is an apocalyptic number.

It is an amenable number.

251939274868 is a deficient number, since it is larger than the sum of its proper divisors (208123748972).

251939274868 is a wasteful number, since it uses less digits than its factorization.

251939274868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738470406 (or 2738470404 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 64.

The spelling of 251939274868 in words is "two hundred fifty-one billion, nine hundred thirty-nine million, two hundred seventy-four thousand, eight hundred sixty-eight".