23565641563 has 4 divisors (see below), whose sum is σ = 24067038240. Its totient is φ = 23064244888.

The previous prime is 23565641557. The next prime is 23565641579. The reversal of 23565641563 is 36514656532.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23565641563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23565641503) 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, 250698268 + ... + 250698361.

It is an arithmetic number, because the mean of its divisors is an integer number (6016759560).

Almost surely, 2^23565641563 is an apocalyptic number.

23565641563 is a deficient number, since it is larger than the sum of its proper divisors (501396677).

23565641563 is an equidigital number, since it uses as much as digits as its factorization.

23565641563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501396676.

The product of its digits is 1944000, while the sum is 46.

The spelling of 23565641563 in words is "twenty-three billion, five hundred sixty-five million, six hundred forty-one thousand, five hundred sixty-three".