668256580 has 24 divisors (see below), whose sum is σ = 1404470592. Its totient is φ = 267087072.

The previous prime is 668256569. The next prime is 668256607. The reversal of 668256580 is 85652866.

It is a self number, because there is not a number n which added to its sum of digits gives 668256580.

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, 13239 + ... + 38881.

It is an arithmetic number, because the mean of its divisors is an integer number (58519608).

Almost surely, 2^668256580 is an apocalyptic number.

It is an amenable number.

668256580 is an abundant number, since it is smaller than the sum of its proper divisors (736214012).

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

668256580 is a wasteful number, since it uses less digits than its factorization.

668256580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26955 (or 26953 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The square root of 668256580 is about 25850.6591792163. The cubic root of 668256580 is about 874.2743720164.

The spelling of 668256580 in words is "six hundred sixty-eight million, two hundred fifty-six thousand, five hundred eighty".