668173918139320 has 64 divisors (see below), whose sum is σ = 1505940307015680. Its totient is φ = 266816455526016.

The previous prime is 668173918139311. The next prime is 668173918139333. The reversal of 668173918139320 is 23931819371866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513770917 + ... + 515069803.

It is an arithmetic number, because the mean of its divisors is an integer number (23530317297120).

Almost surely, 2^{668173918139320} is an apocalyptic number.

It is an amenable number.

668173918139320 is an abundant number, since it is smaller than the sum of its proper divisors (837766388876360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668173918139320 is a wasteful number, since it uses less digits than its factorization.

668173918139320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320692 (or 1320688 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 668173918139320 in words is "six hundred sixty-eight trillion, one hundred seventy-three billion, nine hundred eighteen million, one hundred thirty-nine thousand, three hundred twenty".