668900705856 has 56 divisors (see below), whose sum is σ = 1780657534944. Its totient is φ = 221598996480.

The previous prime is 668900705843. The next prime is 668900705857. The reversal of 668900705856 is 658507009866.

668900705856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 668900705856.

It is not an unprimeable number, because it can be changed into a prime (668900705857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10655385 + ... + 10717976.

Almost surely, 2^668900705856 is an apocalyptic number.

It is an amenable number.

668900705856 is an abundant number, since it is smaller than the sum of its proper divisors (1111756829088).

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

668900705856 is a wasteful number, since it uses less digits than its factorization.

668900705856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21373539 (or 21373529 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 668900705856 in words is "six hundred sixty-eight billion, nine hundred million, seven hundred five thousand, eight hundred fifty-six".