18131118136 has 16 divisors (see below), whose sum is σ = 34243993440. Its totient is φ = 8999386560.

The previous prime is 18131118107. The next prime is 18131118139. The reversal of 18131118136 is 63181113181.

It is a happy number.

It is a super-2 number, since 2×18131118136² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131118139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8270400 + ... + 8272591.

It is an arithmetic number, because the mean of its divisors is an integer number (2140249590).

Almost surely, 2^18131118136 is an apocalyptic number.

It is an amenable number.

18131118136 is a deficient number, since it is larger than the sum of its proper divisors (16112875304).

18131118136 is a wasteful number, since it uses less digits than its factorization.

18131118136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16543134 (or 16543130 counting only the distinct ones).

The product of its digits is 3456, while the sum is 34.

The spelling of 18131118136 in words is "eighteen billion, one hundred thirty-one million, one hundred eighteen thousand, one hundred thirty-six".