16518 has 8 divisors (see below), whose sum is σ = 33048. Its totient is φ = 5504.

The previous prime is 16493. The next prime is 16519. The reversal of 16518 is 81561.

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

16518 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 16494 and 16503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16519) by changing a digit.

16518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371 + ... + 1382.

It is an arithmetic number, because the mean of its divisors is an integer number (4131).

2¹⁶⁵¹⁸ is an apocalyptic number.

16518 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16524).

16518 is a wasteful number, since it uses less digits than its factorization.

16518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758.

The product of its digits is 240, while the sum is 21.

The square root of 16518 is about 128.5223715934. The cubic root of 16518 is about 25.4674710174.

The spelling of 16518 in words is "sixteen thousand, five hundred eighteen".