18115187911 has 2 divisors, whose sum is σ = 18115187912. Its totient is φ = 18115187910.

The previous prime is 18115187843. The next prime is 18115187929. The reversal of 18115187911 is 11978151181.

It is a strong prime.

It is an emirp because it is prime and its reverse (11978151181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18115187911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18115185911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057593955 + 9057593956.

It is an arithmetic number, because the mean of its divisors is an integer number (9057593956).

Almost surely, 2^18115187911 is an apocalyptic number.

18115187911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115187911 is an equidigital number, since it uses as much as digits as its factorization.

18115187911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 43.

The spelling of 18115187911 in words is "eighteen billion, one hundred fifteen million, one hundred eighty-seven thousand, nine hundred eleven".