18115112987 has 2 divisors, whose sum is σ = 18115112988. Its totient is φ = 18115112986.

The previous prime is 18115112941. The next prime is 18115112989. The reversal of 18115112987 is 78921151181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18115112987 is a prime.

Together with 18115112989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18115112989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057556493 + 9057556494.

It is an arithmetic number, because the mean of its divisors is an integer number (9057556494).

Almost surely, 2^18115112987 is an apocalyptic number.

18115112987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115112987 is an equidigital number, since it uses as much as digits as its factorization.

18115112987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 44.

The spelling of 18115112987 in words is "eighteen billion, one hundred fifteen million, one hundred twelve thousand, nine hundred eighty-seven".