665516660031 has 12 divisors (see below), whose sum is σ = 961680489640. Its totient is φ = 443503013040.

The previous prime is 665516659987. The next prime is 665516660077. The reversal of 665516660031 is 130066615566.

It is not a de Polignac number, because 665516660031 - 2⁷ = 665516659903 is a prime.

It is a super-2 number, since 2×665516660031² (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 (665516660131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14539240 + ... + 14584941.

Almost surely, 2^665516660031 is an apocalyptic number.

665516660031 is a deficient number, since it is larger than the sum of its proper divisors (296163829609).

665516660031 is a wasteful number, since it uses less digits than its factorization.

665516660031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29126726 (or 29126723 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 665516660031 in words is "six hundred sixty-five billion, five hundred sixteen million, six hundred sixty thousand, thirty-one".