18868806462397 has 2 divisors, whose sum is σ = 18868806462398. Its totient is φ = 18868806462396.

The previous prime is 18868806462391. The next prime is 18868806462413. The reversal of 18868806462397 is 79326460886881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10570685085081 + 8298121377316 = 3251259^2 + 2880646^2 .

It is a cyclic number.

It is not a de Polignac number, because 18868806462397 - 2³⁵ = 18834446724029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868806462391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434403231198 + 9434403231199.

It is an arithmetic number, because the mean of its divisors is an integer number (9434403231199).

Almost surely, 2^{18868806462397} is an apocalyptic number.

It is an amenable number.

18868806462397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868806462397 is an equidigital number, since it uses as much as digits as its factorization.

18868806462397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1337720832, while the sum is 76.

The spelling of 18868806462397 in words is "eighteen trillion, eight hundred sixty-eight billion, eight hundred six million, four hundred sixty-two thousand, three hundred ninety-seven".