18117035791 has 2 divisors, whose sum is σ = 18117035792. Its totient is φ = 18117035790.

The previous prime is 18117035789. The next prime is 18117035801. The reversal of 18117035791 is 19753071181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18117035791 - 2¹ = 18117035789 is a prime.

Together with 18117035789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18117035731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9058517895 + 9058517896.

It is an arithmetic number, because the mean of its divisors is an integer number (9058517896).

Almost surely, 2^18117035791 is an apocalyptic number.

18117035791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18117035791 is an equidigital number, since it uses as much as digits as its factorization.

18117035791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 43.

The spelling of 18117035791 in words is "eighteen billion, one hundred seventeen million, thirty-five thousand, seven hundred ninety-one".