668687206320 has 180 divisors, whose sum is σ = 2612315412720. Its totient is φ = 152842781952.

The previous prime is 668687206307. The next prime is 668687206381. The reversal of 668687206320 is 23602786866.

It is a happy number.

668687206320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (180).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9441580 + ... + 9512139.

It is an arithmetic number, because the mean of its divisors is an integer number (14512863404).

Almost surely, 2^668687206320 is an apocalyptic number.

668687206320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668687206320 is an abundant number, since it is smaller than the sum of its proper divisors (1943628206400).

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

668687206320 is a wasteful number, since it uses less digits than its factorization.

668687206320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18953752 (or 18953736 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 668687206320 in words is "six hundred sixty-eight billion, six hundred eighty-seven million, two hundred six thousand, three hundred twenty".