12609656909 has 2 divisors, whose sum is σ = 12609656910. Its totient is φ = 12609656908.

The previous prime is 12609656833. The next prime is 12609656957. The reversal of 12609656909 is 90965690621.

12609656909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9167488009 + 3442168900 = 95747^2 + 58670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12609656909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12609656009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6304828454 + 6304828455.

It is an arithmetic number, because the mean of its divisors is an integer number (6304828455).

Almost surely, 2^12609656909 is an apocalyptic number.

It is an amenable number.

12609656909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12609656909 is an equidigital number, since it uses as much as digits as its factorization.

12609656909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 12609656909 in words is "twelve billion, six hundred nine million, six hundred fifty-six thousand, nine hundred nine".