18243565199 has 2 divisors, whose sum is σ = 18243565200. Its totient is φ = 18243565198.

The previous prime is 18243565177. The next prime is 18243565213. The reversal of 18243565199 is 99156534281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18243565199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18243565199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18243565129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9121782599 + 9121782600.

It is an arithmetic number, because the mean of its divisors is an integer number (9121782600).

Almost surely, 2^18243565199 is an apocalyptic number.

18243565199 is a deficient number, since it is larger than the sum of its proper divisors (1).

18243565199 is an equidigital number, since it uses as much as digits as its factorization.

18243565199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 53.

The spelling of 18243565199 in words is "eighteen billion, two hundred forty-three million, five hundred sixty-five thousand, one hundred ninety-nine".