18117214338389 has 2 divisors, whose sum is σ = 18117214338390. Its totient is φ = 18117214338388.

The previous prime is 18117214338371. The next prime is 18117214338401. The reversal of 18117214338389 is 98383341271181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17763207188164 + 354007150225 = 4214642^2 + 594985^2 .

It is a cyclic number.

It is not a de Polignac number, because 18117214338389 - 2⁸ = 18117214338133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18117214368389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9058607169194 + 9058607169195.

It is an arithmetic number, because the mean of its divisors is an integer number (9058607169195).

Almost surely, 2^{18117214338389} is an apocalyptic number.

It is an amenable number.

18117214338389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18117214338389 is an equidigital number, since it uses as much as digits as its factorization.

18117214338389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 59.

The spelling of 18117214338389 in words is "eighteen trillion, one hundred seventeen billion, two hundred fourteen million, three hundred thirty-eight thousand, three hundred eighty-nine".