12756909569 has 2 divisors, whose sum is σ = 12756909570. Its totient is φ = 12756909568.

The previous prime is 12756909563. The next prime is 12756909619. The reversal of 12756909569 is 96590965721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7932217969 + 4824691600 = 89063^2 + 69460^2 .

It is a cyclic number.

It is not a de Polignac number, because 12756909569 - 2²⁰ = 12755860993 is a prime.

It is a super-2 number, since 2×12756909569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12756909563) 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, 6378454784 + 6378454785.

It is an arithmetic number, because the mean of its divisors is an integer number (6378454785).

Almost surely, 2^12756909569 is an apocalyptic number.

It is an amenable number.

12756909569 is a deficient number, since it is larger than the sum of its proper divisors (1).

12756909569 is an equidigital number, since it uses as much as digits as its factorization.

12756909569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9185400, while the sum is 59.

The spelling of 12756909569 in words is "twelve billion, seven hundred fifty-six million, nine hundred nine thousand, five hundred sixty-nine".