665877637706464 has 24 divisors (see below), whose sum is σ = 1315679258455128. Its totient is φ = 331736873654400.

The previous prime is 665877637706443. The next prime is 665877637706483. The reversal of 665877637706464 is 464607736778566.

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, 37560778462 + ... + 37560796189.

It is an arithmetic number, because the mean of its divisors is an integer number (54819969102297).

Almost surely, 2^{665877637706464} is an apocalyptic number.

It is an amenable number.

665877637706464 is a deficient number, since it is larger than the sum of its proper divisors (649801620748664).

665877637706464 is a wasteful number, since it uses less digits than its factorization.

665877637706464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75121574938 (or 75121574930 counting only the distinct ones).

The product of its (nonzero) digits is 35846737920, while the sum is 82.

The spelling of 665877637706464 in words is "six hundred sixty-five trillion, eight hundred seventy-seven billion, six hundred thirty-seven million, seven hundred six thousand, four hundred sixty-four".