12665626513 has 2 divisors, whose sum is σ = 12665626514. Its totient is φ = 12665626512.

The previous prime is 12665626427. The next prime is 12665626541. The reversal of 12665626513 is 31562656621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7284963904 + 5380662609 = 85352^2 + 73353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12665626513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665626513.

It is not a weakly prime, because it can be changed into another prime (12665626553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332813256 + 6332813257.

It is an arithmetic number, because the mean of its divisors is an integer number (6332813257).

Almost surely, 2^12665626513 is an apocalyptic number.

It is an amenable number.

12665626513 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665626513 is an equidigital number, since it uses as much as digits as its factorization.

12665626513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The spelling of 12665626513 in words is "twelve billion, six hundred sixty-five million, six hundred twenty-six thousand, five hundred thirteen".