668115926144 has 64 divisors (see below), whose sum is σ = 1470581360640. Its totient is φ = 300737581056.

The previous prime is 668115926123. The next prime is 668115926201. The reversal of 668115926144 is 441629511866.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6624704 + ... + 6724799.

It is an arithmetic number, because the mean of its divisors is an integer number (22977833760).

Almost surely, 2^668115926144 is an apocalyptic number.

668115926144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

668115926144 is an abundant number, since it is smaller than the sum of its proper divisors (802465434496).

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

668115926144 is a wasteful number, since it uses less digits than its factorization.

668115926144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13349557 (or 13349545 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 53.

The spelling of 668115926144 in words is "six hundred sixty-eight billion, one hundred fifteen million, nine hundred twenty-six thousand, one hundred forty-four".