668397530880 has 432 divisors, whose sum is σ = 2425190302080. Its totient is φ = 169729523712.

The previous prime is 668397530839. The next prime is 668397530891. The reversal of 668397530880 is 88035793866.

668397530880 is a `hidden beast` number, since 6 + 6 + 8 + 3 + 97 + 530 + 8 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24374137 + ... + 24401543.

It is an arithmetic number, because the mean of its divisors is an integer number (5613866440).

Almost surely, 2^668397530880 is an apocalyptic number.

668397530880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668397530880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212595151040).

668397530880 is an abundant number, since it is smaller than the sum of its proper divisors (1756792771200).

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

668397530880 is a wasteful number, since it uses less digits than its factorization.

668397530880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27536 (or 27519 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 668397530880 in words is "six hundred sixty-eight billion, three hundred ninety-seven million, five hundred thirty thousand, eight hundred eighty".