16818516 has 144 divisors (see below), whose sum is σ = 52223808. Its totient is φ = 4704480.

The previous prime is 16818511. The next prime is 16818517. The reversal of 16818516 is 61581861.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1293726 + ... + 1293738.

Almost surely, 2^16818516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16818516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26111904).

16818516 is an abundant number, since it is smaller than the sum of its proper divisors (35405292).

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

16818516 is a wasteful number, since it uses less digits than its factorization.

16818516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 29 counting only the distinct ones).

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

The square root of 16818516 is about 4101.0384050872. The cubic root of 16818516 is about 256.2098905297.

The spelling of 16818516 in words is "sixteen million, eight hundred eighteen thousand, five hundred sixteen".