251555144164 has 12 divisors (see below), whose sum is σ = 455401554300. Its totient is φ = 121440414368.

The previous prime is 251555144147. The next prime is 251555144207. The reversal of 251555144164 is 461441555152.

It can be written as a sum of positive squares in 2 ways, for example, as 148411398564 + 103143745600 = 385242^2 + 321160^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 251555144164.

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, 1084289299 + ... + 1084289530.

It is an arithmetic number, because the mean of its divisors is an integer number (37950129525).

Almost surely, 2^251555144164 is an apocalyptic number.

It is an amenable number.

251555144164 is a deficient number, since it is larger than the sum of its proper divisors (203846410136).

251555144164 is a wasteful number, since it uses less digits than its factorization.

251555144164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168578862 (or 2168578860 counting only the distinct ones).

The product of its digits is 480000, while the sum is 43.

The spelling of 251555144164 in words is "two hundred fifty-one billion, five hundred fifty-five million, one hundred forty-four thousand, one hundred sixty-four".