636601664416 has 12 divisors (see below), whose sum is σ = 1253309526882. Its totient is φ = 318300832192.

The previous prime is 636601664401. The next prime is 636601664417. The reversal of 636601664416 is 614466106636.

It can be written as a sum of positive squares in only one way, i.e., 597832054416 + 38769610000 = 773196^2 + 196900^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 636601664416.

It is not an unprimeable number, because it can be changed into a prime (636601664417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9946900975 + ... + 9946901038.

Almost surely, 2^636601664416 is an apocalyptic number.

It is an amenable number.

636601664416 is a deficient number, since it is larger than the sum of its proper divisors (616707862466).

636601664416 is a wasteful number, since it uses less digits than its factorization.

636601664416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19893802023 (or 19893802015 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 49.

The spelling of 636601664416 in words is "six hundred thirty-six billion, six hundred one million, six hundred sixty-four thousand, four hundred sixteen".