23563664639 has 2 divisors, whose sum is σ = 23563664640. Its totient is φ = 23563664638.

The previous prime is 23563664633. The next prime is 23563664687. The reversal of 23563664639 is 93646636532.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23563664639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23563664633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11781832319 + 11781832320.

It is an arithmetic number, because the mean of its divisors is an integer number (11781832320).

Almost surely, 2^23563664639 is an apocalyptic number.

23563664639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23563664639 is an equidigital number, since it uses as much as digits as its factorization.

23563664639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 53.

The spelling of 23563664639 in words is "twenty-three billion, five hundred sixty-three million, six hundred sixty-four thousand, six hundred thirty-nine".