18111151999 has 2 divisors, whose sum is σ = 18111152000. Its totient is φ = 18111151998.

The previous prime is 18111151957. The next prime is 18111152023. The reversal of 18111151999 is 99915111181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18111151999 - 2¹⁵ = 18111119231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18111151939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055575999 + 9055576000.

It is an arithmetic number, because the mean of its divisors is an integer number (9055576000).

Almost surely, 2^18111151999 is an apocalyptic number.

18111151999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18111151999 is an equidigital number, since it uses as much as digits as its factorization.

18111151999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 46.

The spelling of 18111151999 in words is "eighteen billion, one hundred eleven million, one hundred fifty-one thousand, nine hundred ninety-nine".