18111499243 has 2 divisors, whose sum is σ = 18111499244. Its totient is φ = 18111499242.

The previous prime is 18111499193. The next prime is 18111499249. The reversal of 18111499243 is 34299411181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18111499243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18111499243.

It is not a weakly prime, because it can be changed into another prime (18111499249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055749621 + 9055749622.

It is an arithmetic number, because the mean of its divisors is an integer number (9055749622).

Almost surely, 2^18111499243 is an apocalyptic number.

18111499243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18111499243 is an equidigital number, since it uses as much as digits as its factorization.

18111499243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The spelling of 18111499243 in words is "eighteen billion, one hundred eleven million, four hundred ninety-nine thousand, two hundred forty-three".