668281217884 has 24 divisors (see below), whose sum is σ = 1337447075328. Its totient is φ = 286216670640.

The previous prime is 668281217843. The next prime is 668281217893. The reversal of 668281217884 is 488712182866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7855504 + ... + 7940119.

It is an arithmetic number, because the mean of its divisors is an integer number (55726961472).

Almost surely, 2^668281217884 is an apocalyptic number.

It is an amenable number.

668281217884 is an abundant number, since it is smaller than the sum of its proper divisors (669165857444).

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

668281217884 is a wasteful number, since it uses less digits than its factorization.

668281217884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15797145 (or 15797143 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 61.

The spelling of 668281217884 in words is "six hundred sixty-eight billion, two hundred eighty-one million, two hundred seventeen thousand, eight hundred eighty-four".