668137895184 has 80 divisors (see below), whose sum is σ = 1769466371904. Its totient is φ = 217115289600.

The previous prime is 668137895149. The next prime is 668137895207. The reversal of 668137895184 is 481598731866.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2471227 + ... + 2728229.

Almost surely, 2^668137895184 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668137895184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884733185952).

668137895184 is an abundant number, since it is smaller than the sum of its proper divisors (1101328476720).

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

668137895184 is a wasteful number, since it uses less digits than its factorization.

668137895184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258376 (or 258370 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 66.

The spelling of 668137895184 in words is "six hundred sixty-eight billion, one hundred thirty-seven million, eight hundred ninety-five thousand, one hundred eighty-four".