16565055999 has 16 divisors (see below), whose sum is σ = 22474118400. Its totient is φ = 10849899456.

The previous prime is 16565055977. The next prime is 16565056009. The reversal of 16565055999 is 99955056561.

It is not a de Polignac number, because 16565055999 - 2⁵ = 16565055967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16565055919) 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, 289347 + ... + 341835.

It is an arithmetic number, because the mean of its divisors is an integer number (1404632400).

Almost surely, 2^16565055999 is an apocalyptic number.

16565055999 is a deficient number, since it is larger than the sum of its proper divisors (5909062401).

16565055999 is a wasteful number, since it uses less digits than its factorization.

16565055999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54334.

The product of its (nonzero) digits is 16402500, while the sum is 60.

The spelling of 16565055999 in words is "sixteen billion, five hundred sixty-five million, fifty-five thousand, nine hundred ninety-nine".