18336665 has 4 divisors (see below), whose sum is σ = 22004004. Its totient is φ = 14669328.

The previous prime is 18336631. The next prime is 18336667. The reversal of 18336665 is 56663381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12823561 + 5513104 = 3581^2 + 2348^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336665 - 2¹² = 18332569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18336667) 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, 1833662 + ... + 1833671.

It is an arithmetic number, because the mean of its divisors is an integer number (5501001).

Almost surely, 2^18336665 is an apocalyptic number.

It is an amenable number.

18336665 is a deficient number, since it is larger than the sum of its proper divisors (3667339).

18336665 is an equidigital number, since it uses as much as digits as its factorization.

18336665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667338.

The product of its digits is 77760, while the sum is 38.

The square root of 18336665 is about 4282.1332300619. The cubic root of 18336665 is about 263.6979682181.

The spelling of 18336665 in words is "eighteen million, three hundred thirty-six thousand, six hundred sixty-five".