636122187344 has 120 divisors (see below), whose sum is σ = 1452210052608. Its totient is φ = 269125248000.

The previous prime is 636122187343. The next prime is 636122187347. The reversal of 636122187344 is 443781221636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636122187343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22222289 + ... + 22250895.

Almost surely, 2^636122187344 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 636122187344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726105026304).

636122187344 is an abundant number, since it is smaller than the sum of its proper divisors (816087865264).

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

636122187344 is a wasteful number, since it uses less digits than its factorization.

636122187344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28993 (or 28980 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The spelling of 636122187344 in words is "six hundred thirty-six billion, one hundred twenty-two million, one hundred eighty-seven thousand, three hundred forty-four".