13205555917 has 2 divisors, whose sum is σ = 13205555918. Its totient is φ = 13205555916.

The previous prime is 13205555873. The next prime is 13205555939. The reversal of 13205555917 is 71955550231.

13205555917 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., 9939890601 + 3265665316 = 99699^2 + 57146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13205555917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13205555017) 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, 6602777958 + 6602777959.

It is an arithmetic number, because the mean of its divisors is an integer number (6602777959).

Almost surely, 2^13205555917 is an apocalyptic number.

It is an amenable number.

13205555917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13205555917 is an equidigital number, since it uses as much as digits as its factorization.

13205555917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236250, while the sum is 43.

The spelling of 13205555917 in words is "thirteen billion, two hundred five million, five hundred fifty-five thousand, nine hundred seventeen".