12664125517 has 2 divisors, whose sum is σ = 12664125518. Its totient is φ = 12664125516.

The previous prime is 12664125511. The next prime is 12664125557. The reversal of 12664125517 is 71552146621.

It is an a-pointer prime, because the next prime (12664125557) can be obtained adding 12664125517 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12630612996 + 33512521 = 112386^2 + 5789^2 .

It is a cyclic number.

It is not a de Polignac number, because 12664125517 - 2¹⁹ = 12663601229 is a prime.

It is a super-2 number, since 2×12664125517² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12664125517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12664125511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332062758 + 6332062759.

It is an arithmetic number, because the mean of its divisors is an integer number (6332062759).

Almost surely, 2^12664125517 is an apocalyptic number.

It is an amenable number.

12664125517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664125517 is an equidigital number, since it uses as much as digits as its factorization.

12664125517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The spelling of 12664125517 in words is "twelve billion, six hundred sixty-four million, one hundred twenty-five thousand, five hundred seventeen".