18798355889 has 2 divisors, whose sum is σ = 18798355890. Its totient is φ = 18798355888.

The previous prime is 18798355871. The next prime is 18798355903. The reversal of 18798355889 is 98855389781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18752563600 + 45792289 = 136940^2 + 6767^2 .

It is an emirp because it is prime and its reverse (98855389781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18798355889 - 2²⁸ = 18529920433 is a prime.

It is not a weakly prime, because it can be changed into another prime (18798355189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9399177944 + 9399177945.

It is an arithmetic number, because the mean of its divisors is an integer number (9399177945).

Almost surely, 2^18798355889 is an apocalyptic number.

It is an amenable number.

18798355889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18798355889 is an equidigital number, since it uses as much as digits as its factorization.

18798355889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 71.

The spelling of 18798355889 in words is "eighteen billion, seven hundred ninety-eight million, three hundred fifty-five thousand, eight hundred eighty-nine".