16564265 has 4 divisors (see below), whose sum is σ = 19877124. Its totient is φ = 13251408.

The previous prime is 16564253. The next prime is 16564267. The reversal of 16564265 is 56246561.

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 4481689 + 12082576 = 2117^2 + 3476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16564265 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16564267) 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 3 ways as a sum of consecutive naturals, for example, 1656422 + ... + 1656431.

It is an arithmetic number, because the mean of its divisors is an integer number (4969281).

Almost surely, 2^16564265 is an apocalyptic number.

It is an amenable number.

16564265 is a deficient number, since it is larger than the sum of its proper divisors (3312859).

16564265 is an equidigital number, since it uses as much as digits as its factorization.

16564265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312858.

The product of its digits is 43200, while the sum is 35.

The square root of 16564265 is about 4069.9219894244. The cubic root of 16564265 is about 254.9122599588.

The spelling of 16564265 in words is "sixteen million, five hundred sixty-four thousand, two hundred sixty-five".