18165133 has 12 divisors (see below), whose sum is σ = 21207420. Its totient is φ = 15513792.

The previous prime is 18165127. The next prime is 18165139. The reversal of 18165133 is 33156181.

It is an interprime number because it is at equal distance from previous prime (18165127) and next prime (18165139).

It can be written as a sum of positive squares in 2 ways, for example, as 5866084 + 12299049 = 2422^2 + 3507^2 .

It is not a de Polignac number, because 18165133 - 2¹⁷ = 18034061 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 (18165139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18585 + ... + 19537.

It is an arithmetic number, because the mean of its divisors is an integer number (1767285).

Almost surely, 2^18165133 is an apocalyptic number.

It is an amenable number.

18165133 is a deficient number, since it is larger than the sum of its proper divisors (3042287).

18165133 is an equidigital number, since it uses as much as digits as its factorization.

18165133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1349 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 18165133 is about 4262.0573670470. The cubic root of 18165133 is about 262.8731286271.

The spelling of 18165133 in words is "eighteen million, one hundred sixty-five thousand, one hundred thirty-three".