636343163556 has 48 divisors (see below), whose sum is σ = 1487144602944. Its totient is φ = 211779709056.

The previous prime is 636343163551. The next prime is 636343163579. The reversal of 636343163556 is 655361343636.

It is a junction number, because it is equal to n+sod(n) for n = 636343163499 and 636343163508.

It is not an unprimeable number, because it can be changed into a prime (636343163551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42634311 + ... + 42649233.

It is an arithmetic number, because the mean of its divisors is an integer number (30982179228).

Almost surely, 2^636343163556 is an apocalyptic number.

It is an amenable number.

636343163556 is an abundant number, since it is smaller than the sum of its proper divisors (850801439388).

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

636343163556 is a wasteful number, since it uses less digits than its factorization.

636343163556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20300 (or 20298 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 51.

The spelling of 636343163556 in words is "six hundred thirty-six billion, three hundred forty-three million, one hundred sixty-three thousand, five hundred fifty-six".