16565500 has 48 divisors (see below), whose sum is σ = 41356224. Its totient is φ = 5678400.

The previous prime is 16565477. The next prime is 16565503. The reversal of 16565500 is 556561.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16565503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1134 + ... + 5866.

It is an arithmetic number, because the mean of its divisors is an integer number (861588).

Almost surely, 2^16565500 is an apocalyptic number.

16565500 is a gapful number since it is divisible by the number (10) 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 16565500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20678112).

16565500 is an abundant number, since it is smaller than the sum of its proper divisors (24790724).

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

16565500 is a wasteful number, since it uses less digits than its factorization.

16565500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759 (or 4747 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 16565500 is about 4070.0737094063. The cubic root of 16565500 is about 254.9185950586.

It can be divided in two parts, 16 and 565500, that added together give a triangular number (565516 = T₁₀₆₃).

The spelling of 16565500 in words is "sixteen million, five hundred sixty-five thousand, five hundred".