12566657659 has 2 divisors, whose sum is σ = 12566657660. Its totient is φ = 12566657658.

The previous prime is 12566657611. The next prime is 12566657699. The reversal of 12566657659 is 95675666521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12566657659 - 2¹⁵ = 12566624891 is a prime.

It is not a weakly prime, because it can be changed into another prime (12566657699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283328829 + 6283328830.

It is an arithmetic number, because the mean of its divisors is an integer number (6283328830).

Almost surely, 2^12566657659 is an apocalyptic number.

12566657659 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566657659 is an equidigital number, since it uses as much as digits as its factorization.

12566657659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412000, while the sum is 58.

The spelling of 12566657659 in words is "twelve billion, five hundred sixty-six million, six hundred fifty-seven thousand, six hundred fifty-nine".