636345087638 has 32 divisors (see below), whose sum is σ = 1030826684160. Its totient is φ = 292874401440.

The previous prime is 636345087589. The next prime is 636345087689. The reversal of 636345087638 is 836780543636.

636345087638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×636345087638² (a number of 24 digits) contains 22 as substring.

It is a congruent 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, 19155623 + ... + 19188813.

It is an arithmetic number, because the mean of its divisors is an integer number (32213333880).

Almost surely, 2^636345087638 is an apocalyptic number.

636345087638 is a deficient number, since it is larger than the sum of its proper divisors (394481596522).

636345087638 is a wasteful number, since it uses less digits than its factorization.

636345087638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35252.

The product of its (nonzero) digits is 52254720, while the sum is 59.

The spelling of 636345087638 in words is "six hundred thirty-six billion, three hundred forty-five million, eighty-seven thousand, six hundred thirty-eight".