15605600255617 has 2 divisors, whose sum is σ = 15605600255618. Its totient is φ = 15605600255616.

The previous prime is 15605600255569. The next prime is 15605600255653. The reversal of 15605600255617 is 71655200650651.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14566099701136 + 1039500554481 = 3816556^2 + 1019559^2 .

It is a cyclic number.

It is not a de Polignac number, because 15605600255617 - 2⁴³ = 6809507233409 is a prime.

It is a super-2 number, since 2×15605600255617² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15605600255657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7802800127808 + 7802800127809.

It is an arithmetic number, because the mean of its divisors is an integer number (7802800127809).

Almost surely, 2^{15605600255617} is an apocalyptic number.

It is an amenable number.

15605600255617 is a deficient number, since it is larger than the sum of its proper divisors (1).

15605600255617 is an equidigital number, since it uses as much as digits as its factorization.

15605600255617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 15605600255617 in words is "fifteen trillion, six hundred five billion, six hundred million, two hundred fifty-five thousand, six hundred seventeen".