15660505537 has 2 divisors, whose sum is σ = 15660505538. Its totient is φ = 15660505536.

The previous prime is 15660505481. The next prime is 15660505577. The reversal of 15660505537 is 73550506651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15656015376 + 4490161 = 125124^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 15660505537 - 2¹¹ = 15660503489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15660505493 and 15660505502.

It is not a weakly prime, because it can be changed into another prime (15660505577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830252768 + 7830252769.

It is an arithmetic number, because the mean of its divisors is an integer number (7830252769).

Almost surely, 2^15660505537 is an apocalyptic number.

It is an amenable number.

15660505537 is a deficient number, since it is larger than the sum of its proper divisors (1).

15660505537 is an equidigital number, since it uses as much as digits as its factorization.

15660505537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472500, while the sum is 43.

The spelling of 15660505537 in words is "fifteen billion, six hundred sixty million, five hundred five thousand, five hundred thirty-seven".