16563265 has 4 divisors (see below), whose sum is σ = 19875924. Its totient is φ = 13250608.

The previous prime is 16563259. The next prime is 16563277. The reversal of 16563265 is 56236561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5494336 + 11068929 = 2344^2 + 3327^2 .

It is a cyclic number.

It is not a de Polignac number, because 16563265 - 2³ = 16563257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16563265.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656322 + ... + 1656331.

It is an arithmetic number, because the mean of its divisors is an integer number (4968981).

Almost surely, 2^16563265 is an apocalyptic number.

It is an amenable number.

16563265 is a deficient number, since it is larger than the sum of its proper divisors (3312659).

16563265 is an equidigital number, since it uses as much as digits as its factorization.

16563265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312658.

The product of its digits is 32400, while the sum is 34.

The square root of 16563265 is about 4069.7991350925. The cubic root of 16563265 is about 254.9071300926.

The spelling of 16563265 in words is "sixteen million, five hundred sixty-three thousand, two hundred sixty-five".