636806668 has 12 divisors (see below), whose sum is σ = 1130108112. Its totient is φ = 313918640.

The previous prime is 636806623. The next prime is 636806669. The reversal of 636806668 is 866608636.

636806668 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 (636806669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1120855 + ... + 1121422.

It is an arithmetic number, because the mean of its divisors is an integer number (94175676).

Almost surely, 2^636806668 is an apocalyptic number.

It is an amenable number.

636806668 is a deficient number, since it is larger than the sum of its proper divisors (493301444).

636806668 is a wasteful number, since it uses less digits than its factorization.

636806668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242352 (or 2242350 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 636806668 is about 25235.0285912261. The cubic root of 636806668 is about 860.3381886077.

The spelling of 636806668 in words is "six hundred thirty-six million, eight hundred six thousand, six hundred sixty-eight".