18266 has 4 divisors (see below), whose sum is σ = 27402. Its totient is φ = 9132.

The previous prime is 18257. The next prime is 18269. The reversal of 18266 is 66281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66281 = 79 ⋅839.

It can be written as a sum of positive squares in only one way, i.e., 13225 + 5041 = 115^2 + 71^2 .

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565 + ... + 4568.

2¹⁸²⁶⁶ is an apocalyptic number.

18266 is a deficient number, since it is larger than the sum of its proper divisors (9136).

18266 is an equidigital number, since it uses as much as digits as its factorization.

18266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135.

The product of its digits is 576, while the sum is 23.

The square root of 18266 is about 135.1517665441. The cubic root of 18266 is about 26.3358789755.

The spelling of 18266 in words is "eighteen thousand, two hundred sixty-six".