636371668072 has 64 divisors (see below), whose sum is σ = 1446727680000. Its totient is φ = 256341951936.

The previous prime is 636371668063. The next prime is 636371668087. The reversal of 636371668072 is 270866173636.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2219572 + ... + 2489827.

It is an arithmetic number, because the mean of its divisors is an integer number (22605120000).

Almost surely, 2^636371668072 is an apocalyptic number.

It is an amenable number.

636371668072 is an abundant number, since it is smaller than the sum of its proper divisors (810356011928).

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

636371668072 is a wasteful number, since it uses less digits than its factorization.

636371668072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709558 (or 4709554 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 55.

The spelling of 636371668072 in words is "six hundred thirty-six billion, three hundred seventy-one million, six hundred sixty-eight thousand, seventy-two".