2165565 has 16 divisors (see below), whose sum is σ = 3616128. Its totient is φ = 1104576.

The previous prime is 2165557. The next prime is 2165591. The reversal of 2165565 is 5655612.

It is not a de Polignac number, because 2165565 - 2³ = 2165557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2794 + ... + 3483.

It is an arithmetic number, because the mean of its divisors is an integer number (226008).

2^2165565 is an apocalyptic number.

It is an amenable number.

2165565 is a deficient number, since it is larger than the sum of its proper divisors (1450563).

2165565 is a wasteful number, since it uses less digits than its factorization.

2165565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308.

The product of its digits is 9000, while the sum is 30.

The square root of 2165565 is about 1471.5858792473. The cubic root of 2165565 is about 129.3769994323.

The spelling of 2165565 in words is "two million, one hundred sixty-five thousand, five hundred sixty-five".