636390112668 has 24 divisors (see below), whose sum is σ = 1486714551168. Its totient is φ = 211872282096.

The previous prime is 636390112637. The next prime is 636390112711. The reversal of 636390112668 is 866211093636.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 636390112668.

It is a congruent number.

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, 32209146 + ... + 32228897.

It is an arithmetic number, because the mean of its divisors is an integer number (61946439632).

Almost surely, 2^636390112668 is an apocalyptic number.

It is an amenable number.

636390112668 is an abundant number, since it is smaller than the sum of its proper divisors (850324438500).

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

636390112668 is a wasteful number, since it uses less digits than its factorization.

636390112668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64438873 (or 64438871 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 636390112668 in words is "six hundred thirty-six billion, three hundred ninety million, one hundred twelve thousand, six hundred sixty-eight".