18505117327 has 4 divisors (see below), whose sum is σ = 18781313176. Its totient is φ = 18228921480.

The previous prime is 18505117307. The next prime is 18505117331. The reversal of 18505117327 is 72371150581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18505117327 - 2³¹ = 16357633679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18505117327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18505117307) 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, 138097824 + ... + 138097957.

It is an arithmetic number, because the mean of its divisors is an integer number (4695328294).

Almost surely, 2^18505117327 is an apocalyptic number.

18505117327 is a deficient number, since it is larger than the sum of its proper divisors (276195849).

18505117327 is an equidigital number, since it uses as much as digits as its factorization.

18505117327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276195848.

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 18505117327 in words is "eighteen billion, five hundred five million, one hundred seventeen thousand, three hundred twenty-seven".