13656266009 has 2 divisors, whose sum is σ = 13656266010. Its totient is φ = 13656266008.

The previous prime is 13656265991. The next prime is 13656266051. The reversal of 13656266009 is 90066265631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10815376009 + 2840890000 = 103997^2 + 53300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13656266009 - 2²⁸ = 13387830553 is a prime.

It is not a weakly prime, because it can be changed into another prime (13656266809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828133004 + 6828133005.

It is an arithmetic number, because the mean of its divisors is an integer number (6828133005).

Almost surely, 2^13656266009 is an apocalyptic number.

It is an amenable number.

13656266009 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656266009 is an equidigital number, since it uses as much as digits as its factorization.

13656266009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 13656266009 in words is "thirteen billion, six hundred fifty-six million, two hundred sixty-six thousand, nine".