13666558222717 has 2 divisors, whose sum is σ = 13666558222718. Its totient is φ = 13666558222716.

The previous prime is 13666558222711. The next prime is 13666558222771. The reversal of 13666558222717 is 71722285566631.

Together with next prime (13666558222771) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13666522474276 + 35748441 = 3696826^2 + 5979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13666558222717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13666558222711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833279111358 + 6833279111359.

It is an arithmetic number, because the mean of its divisors is an integer number (6833279111359).

Almost surely, 2^{13666558222717} is an apocalyptic number.

It is an amenable number.

13666558222717 is a deficient number, since it is larger than the sum of its proper divisors (1).

13666558222717 is an equidigital number, since it uses as much as digits as its factorization.

13666558222717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 61.

The spelling of 13666558222717 in words is "thirteen trillion, six hundred sixty-six billion, five hundred fifty-eight million, two hundred twenty-two thousand, seven hundred seventeen".