15564423613 has 2 divisors, whose sum is σ = 15564423614. Its totient is φ = 15564423612.

The previous prime is 15564423517. The next prime is 15564423617. The reversal of 15564423613 is 31632446551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15469886884 + 94536729 = 124378^2 + 9723^2 .

It is a cyclic number.

It is not a de Polignac number, because 15564423613 - 2³³ = 6974489021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15564423617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782211806 + 7782211807.

It is an arithmetic number, because the mean of its divisors is an integer number (7782211807).

Almost surely, 2^15564423613 is an apocalyptic number.

It is an amenable number.

15564423613 is a deficient number, since it is larger than the sum of its proper divisors (1).

15564423613 is an equidigital number, since it uses as much as digits as its factorization.

15564423613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 40.

The spelling of 15564423613 in words is "fifteen billion, five hundred sixty-four million, four hundred twenty-three thousand, six hundred thirteen".