251642900164 has 12 divisors (see below), whose sum is σ = 441330338988. Its totient is φ = 125548517600.

The previous prime is 251642900143. The next prime is 251642900207. The reversal of 251642900164 is 461009246152.

It can be written as a sum of positive squares in 2 ways, for example, as 129702260164 + 121940640000 = 360142^2 + 349200^2 .

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, 68231047 + ... + 68234734.

It is an arithmetic number, because the mean of its divisors is an integer number (36777528249).

Almost surely, 2^251642900164 is an apocalyptic number.

It is an amenable number.

251642900164 is a deficient number, since it is larger than the sum of its proper divisors (189687438824).

251642900164 is a wasteful number, since it uses less digits than its factorization.

251642900164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136466246 (or 136466244 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 251642900164 in words is "two hundred fifty-one billion, six hundred forty-two million, nine hundred thousand, one hundred sixty-four".