251897959798 has 16 divisors (see below), whose sum is σ = 387088062480. Its totient is φ = 122869008000.

The previous prime is 251897959777. The next prime is 251897959847. The reversal of 251897959798 is 897959798152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273138 + ... + 1457626.

It is an arithmetic number, because the mean of its divisors is an integer number (24193003905).

Almost surely, 2^251897959798 is an apocalyptic number.

251897959798 is a deficient number, since it is larger than the sum of its proper divisors (135190102682).

251897959798 is a wasteful number, since it uses less digits than its factorization.

251897959798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201183.

The product of its digits is 1028764800, while the sum is 79.

The spelling of 251897959798 in words is "two hundred fifty-one billion, eight hundred ninety-seven million, nine hundred fifty-nine thousand, seven hundred ninety-eight".