665660665112 has 64 divisors (see below), whose sum is σ = 1357410912000. Its totient is φ = 304989681024.

The previous prime is 665660665099. The next prime is 665660665133. The reversal of 665660665112 is 211566066566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178814 + ... + 1167602.

It is an arithmetic number, because the mean of its divisors is an integer number (21209545500).

Almost surely, 2^665660665112 is an apocalyptic number.

It is an amenable number.

665660665112 is an abundant number, since it is smaller than the sum of its proper divisors (691750246888).

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

665660665112 is a wasteful number, since it uses less digits than its factorization.

665660665112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988960 (or 988956 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 665660665112 in words is "six hundred sixty-five billion, six hundred sixty million, six hundred sixty-five thousand, one hundred twelve".