636345543636 has 96 divisors (see below), whose sum is σ = 1800191433600. Its totient is φ = 192786312960.

The previous prime is 636345543629. The next prime is 636345543637.

It is a happy number.

636345543636 is a `hidden beast` number, since 6 + 3 + 6 + 34 + 5 + 543 + 63 + 6 = 666.

636345543636 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636345543637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5133880 + ... + 5256368.

It is an arithmetic number, because the mean of its divisors is an integer number (18751994100).

Almost surely, 2^636345543636 is an apocalyptic number.

636345543636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

636345543636 is an abundant number, since it is smaller than the sum of its proper divisors (1163845889964).

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

636345543636 is a wasteful number, since it uses less digits than its factorization.

636345543636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126886 (or 126878 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 54.

The spelling of 636345543636 in words is "six hundred thirty-six billion, three hundred forty-five million, five hundred forty-three thousand, six hundred thirty-six".