636814868713 has 4 divisors (see below), whose sum is σ = 645784092288. Its totient is φ = 627845645140.

The previous prime is 636814868663. The next prime is 636814868719. The reversal of 636814868713 is 317868418636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636814868713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636814868719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4484611681 + ... + 4484611822.

It is an arithmetic number, because the mean of its divisors is an integer number (161446023072).

Almost surely, 2^636814868713 is an apocalyptic number.

It is an amenable number.

636814868713 is a deficient number, since it is larger than the sum of its proper divisors (8969223575).

636814868713 is an equidigital number, since it uses as much as digits as its factorization.

636814868713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8969223574.

The product of its digits is 27869184, while the sum is 61.

It can be divided in two parts, 63681 and 4868713, that added together give a palindrome (4932394).

The spelling of 636814868713 in words is "six hundred thirty-six billion, eight hundred fourteen million, eight hundred sixty-eight thousand, seven hundred thirteen".