668922721317 has 12 divisors (see below), whose sum is σ = 1008231348384. Its totient is φ = 426559416360.

The previous prime is 668922721231. The next prime is 668922721321. The reversal of 668922721317 is 713127229866.

It is a happy number.

668922721317 is a `hidden beast` number, since 6 + 6 + 89 + 227 + 21 + 317 = 666.

It is not a de Polignac number, because 668922721317 - 2³⁹ = 119166907429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668922721217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1615755159 + ... + 1615755572.

It is an arithmetic number, because the mean of its divisors is an integer number (84019279032).

Almost surely, 2^668922721317 is an apocalyptic number.

It is an amenable number.

668922721317 is a deficient number, since it is larger than the sum of its proper divisors (339308627067).

668922721317 is a wasteful number, since it uses less digits than its factorization.

668922721317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231510760 (or 3231510757 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 668922721317 in words is "six hundred sixty-eight billion, nine hundred twenty-two million, seven hundred twenty-one thousand, three hundred seventeen".