668187904015 has 8 divisors (see below), whose sum is σ = 801856175328. Its totient is φ = 534529862880.

The previous prime is 668187904001. The next prime is 668187904019. The reversal of 668187904015 is 510409781866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-668187904015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668187904019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2413107 + ... + 2675716.

It is an arithmetic number, because the mean of its divisors is an integer number (100232021916).

Almost surely, 2^668187904015 is an apocalyptic number.

668187904015 is a deficient number, since it is larger than the sum of its proper divisors (133668271313).

668187904015 is a wasteful number, since it uses less digits than its factorization.

668187904015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115089.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 668187904015 in words is "six hundred sixty-eight billion, one hundred eighty-seven million, nine hundred four thousand, fifteen".