18111481115 has 16 divisors (see below), whose sum is σ = 26749265088. Its totient is φ = 11463970176.

The previous prime is 18111481039. The next prime is 18111481159. The reversal of 18111481115 is 51118411181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18111481115 - 2¹² = 18111477019 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19902272 + ... + 19903181.

It is an arithmetic number, because the mean of its divisors is an integer number (1671829068).

Almost surely, 2^18111481115 is an apocalyptic number.

18111481115 is a deficient number, since it is larger than the sum of its proper divisors (8637783973).

18111481115 is a wasteful number, since it uses less digits than its factorization.

18111481115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39805478.

The product of its digits is 1280, while the sum is 32.

Adding to 18111481115 its reverse (51118411181), we get a palindrome (69229892296).

The spelling of 18111481115 in words is "eighteen billion, one hundred eleven million, four hundred eighty-one thousand, one hundred fifteen".