665660715612 has 48 divisors (see below), whose sum is σ = 1627045684992. Its totient is φ = 211413790720.

The previous prime is 665660715607. The next prime is 665660715653. The reversal of 665660715612 is 216517066566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4621314 + ... + 4763177.

It is an arithmetic number, because the mean of its divisors is an integer number (33896785104).

Almost surely, 2^665660715612 is an apocalyptic number.

It is an amenable number.

665660715612 is an abundant number, since it is smaller than the sum of its proper divisors (961384969380).

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

665660715612 is a wasteful number, since it uses less digits than its factorization.

665660715612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384778 (or 9384776 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 665660715612 in words is "six hundred sixty-five billion, six hundred sixty million, seven hundred fifteen thousand, six hundred twelve".