664312451 has 24 divisors (see below), whose sum is σ = 777839760. Its totient is φ = 562496000.

The previous prime is 664312433. The next prime is 664312457. The reversal of 664312451 is 154213466.

It is not a de Polignac number, because 664312451 - 2²⁶ = 597203587 is a prime.

It is a super-2 number, since 2×664312451² = 882622065107254802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664312457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320045 + ... + 322113.

It is an arithmetic number, because the mean of its divisors is an integer number (32409990).

Almost surely, 2^664312451 is an apocalyptic number.

664312451 is a deficient number, since it is larger than the sum of its proper divisors (113527309).

664312451 is a wasteful number, since it uses less digits than its factorization.

664312451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2198 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 664312451 is about 25774.2594655986. The cubic root of 664312451 is about 872.5509535298.

The spelling of 664312451 in words is "six hundred sixty-four million, three hundred twelve thousand, four hundred fifty-one".