15631325617 has 2 divisors, whose sum is σ = 15631325618. Its totient is φ = 15631325616.

The previous prime is 15631325581. The next prime is 15631325627. The reversal of 15631325617 is 71652313651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15547346721 + 83978896 = 124689^2 + 9164^2 .

It is a cyclic number.

It is not a de Polignac number, because 15631325617 - 2¹⁵ = 15631292849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15631325617.

It is not a weakly prime, because it can be changed into another prime (15631325627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7815662808 + 7815662809.

It is an arithmetic number, because the mean of its divisors is an integer number (7815662809).

Almost surely, 2^15631325617 is an apocalyptic number.

It is an amenable number.

15631325617 is a deficient number, since it is larger than the sum of its proper divisors (1).

15631325617 is an equidigital number, since it uses as much as digits as its factorization.

15631325617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The spelling of 15631325617 in words is "fifteen billion, six hundred thirty-one million, three hundred twenty-five thousand, six hundred seventeen".