16565111165 has 4 divisors (see below), whose sum is σ = 19878133404. Its totient is φ = 13252088928.

The previous prime is 16565111137. The next prime is 16565111197. The reversal of 16565111165 is 56111156561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56111156561 = 21559 ⋅2602679.

It can be written as a sum of positive squares in 2 ways, for example, as 7558911364 + 9006199801 = 86942^2 + 94901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16565111165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656511112 + ... + 1656511121.

It is an arithmetic number, because the mean of its divisors is an integer number (4969533351).

Almost surely, 2^16565111165 is an apocalyptic number.

It is an amenable number.

16565111165 is a deficient number, since it is larger than the sum of its proper divisors (3313022239).

16565111165 is an equidigital number, since it uses as much as digits as its factorization.

16565111165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313022238.

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

The spelling of 16565111165 in words is "sixteen billion, five hundred sixty-five million, one hundred eleven thousand, one hundred sixty-five".