636180668964 has 36 divisors (see below), whose sum is σ = 1702718850924. Its totient is φ = 199586092032.

The previous prime is 636180668899. The next prime is 636180668969. The reversal of 636180668964 is 469866081636.

636180668964 is a `hidden beast` number, since 6 + 3 + 618 + 0 + 6 + 6 + 8 + 9 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 355206464064 + 280974204900 = 595992^2 + 530070^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (636180668969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519754837 + ... + 519756060.

It is an arithmetic number, because the mean of its divisors is an integer number (47297745859).

Almost surely, 2^636180668964 is an apocalyptic number.

It is an amenable number.

636180668964 is an abundant number, since it is smaller than the sum of its proper divisors (1066538181960).

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

636180668964 is a wasteful number, since it uses less digits than its factorization.

636180668964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039510924 (or 1039510919 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 636180668964 in words is "six hundred thirty-six billion, one hundred eighty million, six hundred sixty-eight thousand, nine hundred sixty-four".