668820885256 has 64 divisors (see below), whose sum is σ = 1323076694400. Its totient is φ = 316082331648.

The previous prime is 668820885251. The next prime is 668820885269. The reversal of 668820885256 is 652588028866.

668820885256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (668820885251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144233370 + ... + 144238006.

It is an arithmetic number, because the mean of its divisors is an integer number (20673073350).

Almost surely, 2^668820885256 is an apocalyptic number.

It is an amenable number.

668820885256 is a deficient number, since it is larger than the sum of its proper divisors (654255809144).

668820885256 is a wasteful number, since it uses less digits than its factorization.

668820885256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638 (or 6634 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 64.

The spelling of 668820885256 in words is "six hundred sixty-eight billion, eight hundred twenty million, eight hundred eighty-five thousand, two hundred fifty-six".