18390404117 has 2 divisors, whose sum is σ = 18390404118. Its totient is φ = 18390404116.

The previous prime is 18390404111. The next prime is 18390404213. The reversal of 18390404117 is 71140409381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17089287076 + 1301117041 = 130726^2 + 36071^2 .

It is an emirp because it is prime and its reverse (71140409381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18390404117 - 2²⁰ = 18389355541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18390404111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9195202058 + 9195202059.

It is an arithmetic number, because the mean of its divisors is an integer number (9195202059).

Almost surely, 2^18390404117 is an apocalyptic number.

It is an amenable number.

18390404117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18390404117 is an equidigital number, since it uses as much as digits as its factorization.

18390404117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 18390404117 in words is "eighteen billion, three hundred ninety million, four hundred four thousand, one hundred seventeen".