665431115264 has 40 divisors (see below), whose sum is σ = 1329690039480. Its totient is φ = 332683657216.

The previous prime is 665431115179. The next prime is 665431115267. The reversal of 665431115264 is 462511134566.

It is a super-2 number, since 2×665431115264² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665431115267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5825807 + ... + 5938929.

It is an arithmetic number, because the mean of its divisors is an integer number (33242250987).

Almost surely, 2^665431115264 is an apocalyptic number.

665431115264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

665431115264 is a deficient number, since it is larger than the sum of its proper divisors (664258924216).

665431115264 is a wasteful number, since it uses less digits than its factorization.

665431115264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124630 (or 124614 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The spelling of 665431115264 in words is "six hundred sixty-five billion, four hundred thirty-one million, one hundred fifteen thousand, two hundred sixty-four".