8165565 has 12 divisors (see below), whose sum is σ = 14153724. Its totient is φ = 4354944.

The previous prime is 8165543. The next prime is 8165569. The reversal of 8165565 is 5655618.

It can be written as a sum of positive squares in 2 ways, for example, as 5861241 + 2304324 = 2421^2 + 1518^2 .

It is not a de Polignac number, because 8165565 - 2⁵ = 8165533 is a prime.

It is a super-3 number, since 3×8165565³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

8165565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8165569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90684 + ... + 90773.

It is an arithmetic number, because the mean of its divisors is an integer number (1179477).

Almost surely, 2^8165565 is an apocalyptic number.

It is an amenable number.

8165565 is a deficient number, since it is larger than the sum of its proper divisors (5988159).

8165565 is a wasteful number, since it uses less digits than its factorization.

8165565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181468 (or 181465 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 8165565 is about 2857.5452752319. The cubic root of 8165565 is about 201.3702983042.

The spelling of 8165565 in words is "eight million, one hundred sixty-five thousand, five hundred sixty-five".