16565521423 has 16 divisors (see below), whose sum is σ = 18330451200. Its totient is φ = 14844012480.

The previous prime is 16565521421. The next prime is 16565521439. The reversal of 16565521423 is 32412556561.

It is not a de Polignac number, because 16565521423 - 2¹ = 16565521421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16565521421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1503348 + ... + 1514326.

It is an arithmetic number, because the mean of its divisors is an integer number (1145653200).

Almost surely, 2^16565521423 is an apocalyptic number.

16565521423 is a deficient number, since it is larger than the sum of its proper divisors (1764929777).

16565521423 is a wasteful number, since it uses less digits than its factorization.

16565521423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942.

The product of its digits is 216000, while the sum is 40.

The spelling of 16565521423 in words is "sixteen billion, five hundred sixty-five million, five hundred twenty-one thousand, four hundred twenty-three".