15506656013 has 2 divisors, whose sum is σ = 15506656014. Its totient is φ = 15506656012.

The previous prime is 15506655929. The next prime is 15506656019. The reversal of 15506656013 is 31065660551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9357273289 + 6149382724 = 96733^2 + 78418^2 .

It is a cyclic number.

It is not a de Polignac number, because 15506656013 - 2¹⁸ = 15506393869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15506656019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7753328006 + 7753328007.

It is an arithmetic number, because the mean of its divisors is an integer number (7753328007).

Almost surely, 2^15506656013 is an apocalyptic number.

It is an amenable number.

15506656013 is a deficient number, since it is larger than the sum of its proper divisors (1).

15506656013 is an equidigital number, since it uses as much as digits as its factorization.

15506656013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 15506656013 in words is "fifteen billion, five hundred six million, six hundred fifty-six thousand, thirteen".