16559816 has 96 divisors (see below), whose sum is σ = 40877760. Its totient is φ = 6120576.

The previous prime is 16559801. The next prime is 16559821. The reversal of 16559816 is 61895561.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385091 + ... + 385133.

It is an arithmetic number, because the mean of its divisors is an integer number (425810).

Almost surely, 2^16559816 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 16559816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20438880).

16559816 is an abundant number, since it is smaller than the sum of its proper divisors (24317944).

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

16559816 is a wasteful number, since it uses less digits than its factorization.

16559816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 88 counting only the distinct ones).

The product of its digits is 64800, while the sum is 41.

The square root of 16559816 is about 4069.3753820458. The cubic root of 16559816 is about 254.8894355997.

The spelling of 16559816 in words is "sixteen million, five hundred fifty-nine thousand, eight hundred sixteen".