665603672616 has 48 divisors (see below), whose sum is σ = 1815834863700. Its totient is φ = 220248413952.

The previous prime is 665603672593. The next prime is 665603672627. The reversal of 665603672616 is 616276306566.

665603672616 is a `hidden beast` number, since 6 + 6 + 5 + 603 + 6 + 7 + 26 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 665454588516 + 149084100 = 815754^2 + 12210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33729171 + ... + 33748898.

Almost surely, 2^665603672616 is an apocalyptic number.

It is an amenable number.

665603672616 is an abundant number, since it is smaller than the sum of its proper divisors (1150231191084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665603672616 is a wasteful number, since it uses less digits than its factorization.

665603672616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67478218 (or 67478211 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 665603672616 in words is "six hundred sixty-five billion, six hundred three million, six hundred seventy-two thousand, six hundred sixteen".