251405552400555 has 48 divisors (see below), whose sum is σ = 495447004611360. Its totient is φ = 108167767077888.

The previous prime is 251405552400547. The next prime is 251405552400637. The reversal of 251405552400555 is 555004255504152.

It is not a de Polignac number, because 251405552400555 - 2³ = 251405552400547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10060233700 + ... + 10060258689.

It is an arithmetic number, because the mean of its divisors is an integer number (10321812596070).

Almost surely, 2^{251405552400555} is an apocalyptic number.

251405552400555 is a deficient number, since it is larger than the sum of its proper divisors (244041452210805).

251405552400555 is a wasteful number, since it uses less digits than its factorization.

251405552400555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20120492428 (or 20120492421 counting only the distinct ones).

The product of its (nonzero) digits is 5000000, while the sum is 48.

The spelling of 251405552400555 in words is "two hundred fifty-one trillion, four hundred five billion, five hundred fifty-two million, four hundred thousand, five hundred fifty-five".