15561116505023 has 2 divisors, whose sum is σ = 15561116505024. Its totient is φ = 15561116505022.

The previous prime is 15561116505013. The next prime is 15561116505041. The reversal of 15561116505023 is 32050561116551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15561116505023 - 2²⁸ = 15560848069567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15561116505013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780558252511 + 7780558252512.

It is an arithmetic number, because the mean of its divisors is an integer number (7780558252512).

Almost surely, 2^{15561116505023} is an apocalyptic number.

15561116505023 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561116505023 is an equidigital number, since it uses as much as digits as its factorization.

15561116505023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 15561116505023 in words is "fifteen trillion, five hundred sixty-one billion, one hundred sixteen million, five hundred five thousand, twenty-three".