16115116565 has 4 divisors (see below), whose sum is σ = 19338139884. Its totient is φ = 12892093248.

The previous prime is 16115116547. The next prime is 16115116597. The reversal of 16115116565 is 56561151161.

It is a happy number.

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 2426350564 + 13688766001 = 49258^2 + 116999^2 .

It is a cyclic number.

It is not a de Polignac number, because 16115116565 - 2⁸ = 16115116309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 1611511652 + ... + 1611511661.

It is an arithmetic number, because the mean of its divisors is an integer number (4834534971).

Almost surely, 2^16115116565 is an apocalyptic number.

It is an amenable number.

16115116565 is a deficient number, since it is larger than the sum of its proper divisors (3223023319).

16115116565 is an equidigital number, since it uses as much as digits as its factorization.

16115116565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223023318.

The product of its digits is 27000, while the sum is 38.

The spelling of 16115116565 in words is "sixteen billion, one hundred fifteen million, one hundred sixteen thousand, five hundred sixty-five".