665317912 has 32 divisors (see below), whose sum is σ = 1445220000. Its totient is φ = 281228544.

The previous prime is 665317883. The next prime is 665317997. The reversal of 665317912 is 219713566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77287 + ... + 85462.

It is an arithmetic number, because the mean of its divisors is an integer number (45163125).

Almost surely, 2^665317912 is an apocalyptic number.

It is an amenable number.

665317912 is an abundant number, since it is smaller than the sum of its proper divisors (779902088).

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

665317912 is a wasteful number, since it uses less digits than its factorization.

665317912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162835 (or 162831 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 665317912 is about 25793.7572292212. The cubic root of 665317912 is about 872.9909441338.

The spelling of 665317912 in words is "six hundred sixty-five million, three hundred seventeen thousand, nine hundred twelve".