665385712 has 20 divisors (see below), whose sum is σ = 1365019776. Its totient is φ = 313122560.

The previous prime is 665385703. The next prime is 665385737. The reversal of 665385712 is 217583566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1222864 + ... + 1223407.

Almost surely, 2^665385712 is an apocalyptic number.

It is an amenable number.

665385712 is an abundant number, since it is smaller than the sum of its proper divisors (699634064).

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

665385712 is a wasteful number, since it uses less digits than its factorization.

665385712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446296 (or 2446290 counting only the distinct ones).

The product of its digits is 302400, while the sum is 43.

The square root of 665385712 is about 25795.0714672396. The cubic root of 665385712 is about 873.0205975143.

The spelling of 665385712 in words is "six hundred sixty-five million, three hundred eighty-five thousand, seven hundred twelve".