16011165565 has 4 divisors (see below), whose sum is σ = 19213398684. Its totient is φ = 12808932448.

The previous prime is 16011165557. The next prime is 16011165571. The reversal of 16011165565 is 56556111061.

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 10995409881 + 5015755684 = 104859^2 + 70822^2 .

It is a cyclic number.

It is not a de Polignac number, because 16011165565 - 2³ = 16011165557 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, 1601116552 + ... + 1601116561.

It is an arithmetic number, because the mean of its divisors is an integer number (4803349671).

Almost surely, 2^16011165565 is an apocalyptic number.

It is an amenable number.

16011165565 is a deficient number, since it is larger than the sum of its proper divisors (3202233119).

16011165565 is an equidigital number, since it uses as much as digits as its factorization.

16011165565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202233118.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 16011165565 in words is "sixteen billion, eleven million, one hundred sixty-five thousand, five hundred sixty-five".