12688443692209 has 2 divisors, whose sum is σ = 12688443692210. Its totient is φ = 12688443692208.

The previous prime is 12688443692207. The next prime is 12688443692317. The reversal of 12688443692209 is 90229634488621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12654134280225 + 34309411984 = 3557265^2 + 185228^2 .

It is a cyclic number.

It is not a de Polignac number, because 12688443692209 - 2¹ = 12688443692207 is a prime.

Together with 12688443692207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12688443692207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344221846104 + 6344221846105.

It is an arithmetic number, because the mean of its divisors is an integer number (6344221846105).

Almost surely, 2^{12688443692209} is an apocalyptic number.

It is an amenable number.

12688443692209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12688443692209 is an equidigital number, since it uses as much as digits as its factorization.

12688443692209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71663616, while the sum is 64.

The spelling of 12688443692209 in words is "twelve trillion, six hundred eighty-eight billion, four hundred forty-three million, six hundred ninety-two thousand, two hundred nine".