18182161791 has 12 divisors (see below), whose sum is σ = 26275879968. Its totient is φ = 12115553184.

The previous prime is 18182161763. The next prime is 18182161807. The reversal of 18182161791 is 19716128181.

18182161791 is a `hidden beast` number, since 1 + 8 + 1 + 8 + 21 + 617 + 9 + 1 = 666.

It is not a de Polignac number, because 18182161791 - 2³⁰ = 17108419967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18162161791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471070 + ... + 508203.

It is an arithmetic number, because the mean of its divisors is an integer number (2189656664).

Almost surely, 2^18182161791 is an apocalyptic number.

18182161791 is a deficient number, since it is larger than the sum of its proper divisors (8093718177).

18182161791 is a wasteful number, since it uses less digits than its factorization.

18182161791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981342 (or 981339 counting only the distinct ones).

The product of its digits is 48384, while the sum is 45.

The spelling of 18182161791 in words is "eighteen billion, one hundred eighty-two million, one hundred sixty-one thousand, seven hundred ninety-one".