23565036643 has 2 divisors, whose sum is σ = 23565036644. Its totient is φ = 23565036642.

The previous prime is 23565036581. The next prime is 23565036749. The reversal of 23565036643 is 34663056532.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23565036643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23565036643.

It is not a weakly prime, because it can be changed into another prime (23565034643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11782518321 + 11782518322.

It is an arithmetic number, because the mean of its divisors is an integer number (11782518322).

Almost surely, 2^23565036643 is an apocalyptic number.

23565036643 is a deficient number, since it is larger than the sum of its proper divisors (1).

23565036643 is an equidigital number, since it uses as much as digits as its factorization.

23565036643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 43.

The spelling of 23565036643 in words is "twenty-three billion, five hundred sixty-five million, thirty-six thousand, six hundred forty-three".