668785015 has 12 divisors (see below), whose sum is σ = 852529176. Its totient is φ = 503554688.

The previous prime is 668784983. The next prime is 668785021. The reversal of 668785015 is 510587866.

It is not a de Polignac number, because 668785015 - 2⁵ = 668784983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229969 + ... + 232858.

It is an arithmetic number, because the mean of its divisors is an integer number (71044098).

Almost surely, 2^668785015 is an apocalyptic number.

668785015 is a deficient number, since it is larger than the sum of its proper divisors (183744161).

668785015 is a wasteful number, since it uses less digits than its factorization.

668785015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462866 (or 462849 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 668785015 is about 25860.8780786732. The cubic root of 668785015 is about 874.5047602973.

The spelling of 668785015 in words is "six hundred sixty-eight million, seven hundred eighty-five thousand, fifteen".