665515712 has 14 divisors (see below), whose sum is σ = 1320632868. Its totient is φ = 332757824.

The previous prime is 665515703. The next prime is 665515727. The reversal of 665515712 is 217515566.

It is a super-2 number, since 2×665515712² = 885822325837733888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199278 + ... + 5199405.

Almost surely, 2^665515712 is an apocalyptic number.

It is an amenable number.

665515712 is a deficient number, since it is larger than the sum of its proper divisors (655117156).

665515712 is a wasteful number, since it uses less digits than its factorization.

665515712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10398695 (or 10398685 counting only the distinct ones).

The product of its digits is 63000, while the sum is 38.

The square root of 665515712 is about 25797.5912053819. The cubic root of 665515712 is about 873.0774493949.

The spelling of 665515712 in words is "six hundred sixty-five million, five hundred fifteen thousand, seven hundred twelve".