2265665 has 4 divisors (see below), whose sum is σ = 2718804. Its totient is φ = 1812528.

The previous prime is 2265647. The next prime is 2265671. The reversal of 2265665 is 5665622.

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 541696 + 1723969 = 736^2 + 1313^2 .

It is a cyclic number.

It is not a de Polignac number, because 2265665 - 2¹⁰ = 2264641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226562 + ... + 226571.

It is an arithmetic number, because the mean of its divisors is an integer number (679701).

2^2265665 is an apocalyptic number.

It is an amenable number.

2265665 is a deficient number, since it is larger than the sum of its proper divisors (453139).

2265665 is an equidigital number, since it uses as much as digits as its factorization.

2265665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453138.

The product of its digits is 21600, while the sum is 32.

The square root of 2265665 is about 1505.2126095672. The cubic root of 2265665 is about 131.3404697494.

The spelling of 2265665 in words is "two million, two hundred sixty-five thousand, six hundred sixty-five".