251442664451 has 16 divisors (see below), whose sum is σ = 277028344320. Its totient is φ = 226312557120.

The previous prime is 251442664409. The next prime is 251442664471. The reversal of 251442664451 is 154466244152.

It is a cyclic number.

It is not a de Polignac number, because 251442664451 - 2¹⁰ = 251442663427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251442664471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5368631 + ... + 5415263.

It is an arithmetic number, because the mean of its divisors is an integer number (17314271520).

Almost surely, 2^251442664451 is an apocalyptic number.

251442664451 is a deficient number, since it is larger than the sum of its proper divisors (25585679869).

251442664451 is a wasteful number, since it uses less digits than its factorization.

251442664451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51506.

The product of its digits is 921600, while the sum is 44.

The spelling of 251442664451 in words is "two hundred fifty-one billion, four hundred forty-two million, six hundred sixty-four thousand, four hundred fifty-one".