12906609817 has 2 divisors, whose sum is σ = 12906609818. Its totient is φ = 12906609816.

The previous prime is 12906609799. The next prime is 12906609839. The reversal of 12906609817 is 71890660921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12371890441 + 534719376 = 111229^2 + 23124^2 .

It is a cyclic number.

It is not a de Polignac number, because 12906609817 - 2²⁷ = 12772392089 is a prime.

It is not a weakly prime, because it can be changed into another prime (12906609217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6453304908 + 6453304909.

It is an arithmetic number, because the mean of its divisors is an integer number (6453304909).

Almost surely, 2^12906609817 is an apocalyptic number.

It is an amenable number.

12906609817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12906609817 is an equidigital number, since it uses as much as digits as its factorization.

12906609817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 12906609817 in words is "twelve billion, nine hundred six million, six hundred nine thousand, eight hundred seventeen".