665876972 has 6 divisors (see below), whose sum is σ = 1165284708. Its totient is φ = 332938484.

The previous prime is 665876947. The next prime is 665876999. The reversal of 665876972 is 279678566.

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 as a sum of consecutive naturals, namely, 83234618 + ... + 83234625.

It is an arithmetic number, because the mean of its divisors is an integer number (194214118).

Almost surely, 2^665876972 is an apocalyptic number.

It is an amenable number.

665876972 is a deficient number, since it is larger than the sum of its proper divisors (499407736).

665876972 is a wasteful number, since it uses less digits than its factorization.

665876972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166469247 (or 166469245 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 56.

The square root of 665876972 is about 25804.5920719549. The cubic root of 665876972 is about 873.2353975346.

The spelling of 665876972 in words is "six hundred sixty-five million, eight hundred seventy-six thousand, nine hundred seventy-two".