18161325191 has 8 divisors (see below), whose sum is σ = 18606142464. Its totient is φ = 17716596480.

The previous prime is 18161325181. The next prime is 18161325209. The reversal of 18161325191 is 19152316181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18161325191 - 2¹⁸ = 18161063047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161325121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613370 + ... + 642296.

It is an arithmetic number, because the mean of its divisors is an integer number (2325767808).

Almost surely, 2^18161325191 is an apocalyptic number.

18161325191 is a deficient number, since it is larger than the sum of its proper divisors (444817273).

18161325191 is a wasteful number, since it uses less digits than its factorization.

18161325191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44281.

The product of its digits is 12960, while the sum is 38.

The spelling of 18161325191 in words is "eighteen billion, one hundred sixty-one million, three hundred twenty-five thousand, one hundred ninety-one".