18516685 has 8 divisors (see below), whose sum is σ = 24240096. Its totient is φ = 13466640.

The previous prime is 18516647. The next prime is 18516713. The reversal of 18516685 is 58661581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18516685 - 2¹⁵ = 18483917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168279 + ... + 168388.

It is an arithmetic number, because the mean of its divisors is an integer number (3030012).

Almost surely, 2^18516685 is an apocalyptic number.

It is an amenable number.

18516685 is a deficient number, since it is larger than the sum of its proper divisors (5723411).

18516685 is a wasteful number, since it uses less digits than its factorization.

18516685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336683.

The product of its digits is 57600, while the sum is 40.

The square root of 18516685 is about 4303.1017882453. The cubic root of 18516685 is about 264.5581101188.

Subtracting 18516685 from its reverse (58661581), we obtain a square (40144896 = 6336²).

The spelling of 18516685 in words is "eighteen million, five hundred sixteen thousand, six hundred eighty-five".