15564113729 has 2 divisors, whose sum is σ = 15564113730. Its totient is φ = 15564113728.

The previous prime is 15564113707. The next prime is 15564113737. The reversal of 15564113729 is 92731146551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11908702129 + 3655411600 = 109127^2 + 60460^2 .

It is a cyclic number.

It is not a de Polignac number, because 15564113729 - 2²⁸ = 15295678273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15564113729.

It is not a weakly prime, because it can be changed into another prime (15564113129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782056864 + 7782056865.

It is an arithmetic number, because the mean of its divisors is an integer number (7782056865).

Almost surely, 2^15564113729 is an apocalyptic number.

It is an amenable number.

15564113729 is a deficient number, since it is larger than the sum of its proper divisors (1).

15564113729 is an equidigital number, since it uses as much as digits as its factorization.

15564113729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The spelling of 15564113729 in words is "fifteen billion, five hundred sixty-four million, one hundred thirteen thousand, seven hundred twenty-nine".