18568242555917 has 2 divisors, whose sum is σ = 18568242555918. Its totient is φ = 18568242555916.

The previous prime is 18568242555913. The next prime is 18568242555953. The reversal of 18568242555917 is 71955524286581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17823713450596 + 744529105321 = 4221814^2 + 862861^2 .

It is a cyclic number.

It is not a de Polignac number, because 18568242555917 - 2² = 18568242555913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18568242555913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9284121277958 + 9284121277959.

It is an arithmetic number, because the mean of its divisors is an integer number (9284121277959).

Almost surely, 2^{18568242555917} is an apocalyptic number.

It is an amenable number.

18568242555917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18568242555917 is an equidigital number, since it uses as much as digits as its factorization.

18568242555917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920000, while the sum is 68.

The spelling of 18568242555917 in words is "eighteen trillion, five hundred sixty-eight billion, two hundred forty-two million, five hundred fifty-five thousand, nine hundred seventeen".