18131118107 has 2 divisors, whose sum is σ = 18131118108. Its totient is φ = 18131118106.

The previous prime is 18131118079. The next prime is 18131118139. The reversal of 18131118107 is 70181113181.

It is a happy number.

It is an a-pointer prime, because the next prime (18131118139) can be obtained adding 18131118107 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18131118107 is a prime.

It is not a weakly prime, because it can be changed into another prime (18131118197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065559053 + 9065559054.

It is an arithmetic number, because the mean of its divisors is an integer number (9065559054).

Almost surely, 2^18131118107 is an apocalyptic number.

18131118107 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131118107 is an equidigital number, since it uses as much as digits as its factorization.

18131118107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 32.

The spelling of 18131118107 in words is "eighteen billion, one hundred thirty-one million, one hundred eighteen thousand, one hundred seven".