16585273865 has 16 divisors (see below), whose sum is σ = 21642599952. Its totient is φ = 12150226944.

The previous prime is 16585273853. The next prime is 16585273919. The reversal of 16585273865 is 56837258561.

It is a happy number.

16585273865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1378191376 + 15207082489 = 37124^2 + 123317^2 .

It is not a de Polignac number, because 16585273865 - 2⁸ = 16585273609 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 16585273865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2633624 + ... + 2639913.

It is an arithmetic number, because the mean of its divisors is an integer number (1352662497).

Almost surely, 2^16585273865 is an apocalyptic number.

It is an amenable number.

16585273865 is a deficient number, since it is larger than the sum of its proper divisors (5057326087).

16585273865 is a wasteful number, since it uses less digits than its factorization.

16585273865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273596.

The product of its digits is 12096000, while the sum is 56.

The spelling of 16585273865 in words is "sixteen billion, five hundred eighty-five million, two hundred seventy-three thousand, eight hundred sixty-five".