636156042544 has 120 divisors (see below), whose sum is σ = 1420358734080. Its totient is φ = 273699043200.

The previous prime is 636156042527. The next prime is 636156042581. The reversal of 636156042544 is 445240651636.

636156042544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 636156042494 and 636156042503.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83800189 + ... + 83807779.

It is an arithmetic number, because the mean of its divisors is an integer number (11836322784).

Almost surely, 2^636156042544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636156042544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710179367040).

636156042544 is an abundant number, since it is smaller than the sum of its proper divisors (784202691536).

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

636156042544 is a wasteful number, since it uses less digits than its factorization.

636156042544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967 (or 8942 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 636156042544 in words is "six hundred thirty-six billion, one hundred fifty-six million, forty-two thousand, five hundred forty-four".