18066361 has 4 divisors (see below), whose sum is σ = 18284112. Its totient is φ = 17848612.

The previous prime is 18066337. The next prime is 18066379. The reversal of 18066361 is 16366081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18066361 - 2¹³ = 18058169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18063361) 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, 108751 + ... + 108916.

It is an arithmetic number, because the mean of its divisors is an integer number (4571028).

Almost surely, 2^18066361 is an apocalyptic number.

It is an amenable number.

18066361 is a deficient number, since it is larger than the sum of its proper divisors (217751).

18066361 is an equidigital number, since it uses as much as digits as its factorization.

18066361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217750.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18066361 is about 4250.4542110226. The cubic root of 18066361 is about 262.3958092929.

The spelling of 18066361 in words is "eighteen million, sixty-six thousand, three hundred sixty-one".