16518816 has 60 divisors (see below), whose sum is σ = 48589002. Its totient is φ = 5505408.

The previous prime is 16518811. The next prime is 16518823. The reversal of 16518816 is 61881561.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 4822416 = 3420^2 + 2196^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16518811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 595 + ... + 5778.

Almost surely, 2^16518816 is an apocalyptic number.

16518816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16518816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24294501).

16518816 is an abundant number, since it is smaller than the sum of its proper divisors (32070186).

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

16518816 is an equidigital number, since it uses as much as digits as its factorization.

16518816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6395 (or 6378 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 16518816 is about 4064.3346318924. The cubic root of 16518816 is about 254.6789038036.

It can be divided in two parts, 165 and 18816, that added together give a palindrome (18981).

The spelling of 16518816 in words is "sixteen million, five hundred eighteen thousand, eight hundred sixteen".