665362107631 has 4 divisors (see below), whose sum is σ = 716543808232. Its totient is φ = 614180407032.

The previous prime is 665362107511. The next prime is 665362107703. The reversal of 665362107631 is 136701263566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665362107631 - 2³³ = 656772173039 is a prime.

It is a super-2 number, since 2×665362107631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665362107131) 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, 25590850281 + ... + 25590850306.

It is an arithmetic number, because the mean of its divisors is an integer number (179135952058).

Almost surely, 2^665362107631 is an apocalyptic number.

665362107631 is a deficient number, since it is larger than the sum of its proper divisors (51181700601).

665362107631 is a wasteful number, since it uses less digits than its factorization.

665362107631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51181700600.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 665362107631 in words is "six hundred sixty-five billion, three hundred sixty-two million, one hundred seven thousand, six hundred thirty-one".