665165156504 has 16 divisors (see below), whose sum is σ = 1276188963720. Its totient is φ = 324848099520.

The previous prime is 665165156483. The next prime is 665165156521. The reversal of 665165156504 is 405651561566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966809477 + ... + 966810164.

Almost surely, 2^665165156504 is an apocalyptic number.

It is an amenable number.

665165156504 is a deficient number, since it is larger than the sum of its proper divisors (611023807216).

665165156504 is a wasteful number, since it uses less digits than its factorization.

665165156504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933619690 (or 1933619686 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 665165156504 in words is "six hundred sixty-five billion, one hundred sixty-five million, one hundred fifty-six thousand, five hundred four".