665855351632 has 20 divisors (see below), whose sum is σ = 1290308416960. Its totient is φ = 332872534368.

The previous prime is 665855351563. The next prime is 665855351653. The reversal of 665855351632 is 236153558566.

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, 3346632 + ... + 3540007.

It is an arithmetic number, because the mean of its divisors is an integer number (64515420848).

Almost surely, 2^665855351632 is an apocalyptic number.

It is an amenable number.

665855351632 is a deficient number, since it is larger than the sum of its proper divisors (624453065328).

665855351632 is a wasteful number, since it uses less digits than its factorization.

665855351632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892690 (or 6892684 counting only the distinct ones).

The product of its digits is 19440000, while the sum is 55.

The spelling of 665855351632 in words is "six hundred sixty-five billion, eight hundred fifty-five million, three hundred fifty-one thousand, six hundred thirty-two".