660917872 has 10 divisors (see below), whose sum is σ = 1280528408. Its totient is φ = 330458928.

The previous prime is 660917867. The next prime is 660917879. The reversal of 660917872 is 278719066.

It is a happy number.

660917872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660917879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20653668 + ... + 20653699.

Almost surely, 2^660917872 is an apocalyptic number.

It is an amenable number.

660917872 is a deficient number, since it is larger than the sum of its proper divisors (619610536).

660917872 is a wasteful number, since it uses less digits than its factorization.

660917872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41307375 (or 41307369 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 660917872 is about 25708.3230102626. The cubic root of 660917872 is about 871.0621949390.

The spelling of 660917872 in words is "six hundred sixty million, nine hundred seventeen thousand, eight hundred seventy-two".