15561596563 has 2 divisors, whose sum is σ = 15561596564. Its totient is φ = 15561596562.

The previous prime is 15561596509. The next prime is 15561596621. The reversal of 15561596563 is 36569516551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15561596563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15561596563.

It is not a weakly prime, because it can be changed into another prime (15561590563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780798281 + 7780798282.

It is an arithmetic number, because the mean of its divisors is an integer number (7780798282).

Almost surely, 2^15561596563 is an apocalyptic number.

15561596563 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561596563 is an equidigital number, since it uses as much as digits as its factorization.

15561596563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3645000, while the sum is 52.

The spelling of 15561596563 in words is "fifteen billion, five hundred sixty-one million, five hundred ninety-six thousand, five hundred sixty-three".