636086564644 has 12 divisors (see below), whose sum is σ = 1113187437964. Its totient is φ = 318033010944.

The previous prime is 636086564627. The next prime is 636086564647. The reversal of 636086564644 is 446465680636.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 117559836900 + 518526727744 = 342870^2 + 720088^2 .

It is a super-2 number, since 2×636086564644² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (636086564647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2427657 + ... + 2676880.

Almost surely, 2^636086564644 is an apocalyptic number.

It is an amenable number.

636086564644 is a deficient number, since it is larger than the sum of its proper divisors (477100873320).

636086564644 is a wasteful number, since it uses less digits than its factorization.

636086564644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135694 (or 5135692 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 58.

The spelling of 636086564644 in words is "six hundred thirty-six billion, eighty-six million, five hundred sixty-four thousand, six hundred forty-four".