12665251597 has 2 divisors, whose sum is σ = 12665251598. Its totient is φ = 12665251596.

The previous prime is 12665251541. The next prime is 12665251603. The reversal of 12665251597 is 79515256621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7250352201 + 5414899396 = 85149^2 + 73586^2 .

It is a cyclic number.

It is not a de Polignac number, because 12665251597 - 2²³ = 12656862989 is a prime.

It is a super-2 number, since 2×12665251597² (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 12665251597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12665251397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332625798 + 6332625799.

It is an arithmetic number, because the mean of its divisors is an integer number (6332625799).

Almost surely, 2^12665251597 is an apocalyptic number.

It is an amenable number.

12665251597 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665251597 is an equidigital number, since it uses as much as digits as its factorization.

12665251597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 49.

The spelling of 12665251597 in words is "twelve billion, six hundred sixty-five million, two hundred fifty-one thousand, five hundred ninety-seven".