18165159 has 18 divisors (see below), whose sum is σ = 27697176. Its totient is φ = 11470680.

The previous prime is 18165143. The next prime is 18165211. The reversal of 18165159 is 95156181.

It is not a de Polignac number, because 18165159 - 2⁴ = 18165143 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 454 + ... + 6044.

It is an arithmetic number, because the mean of its divisors is an integer number (1538732).

Almost surely, 2^18165159 is an apocalyptic number.

18165159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18165159 is a deficient number, since it is larger than the sum of its proper divisors (9532017).

18165159 is a wasteful number, since it uses less digits than its factorization.

18165159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635 (or 5613 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 18165159 is about 4262.0604172161. The cubic root of 18165159 is about 262.8732540450.

The spelling of 18165159 in words is "eighteen million, one hundred sixty-five thousand, one hundred fifty-nine".