2166265 has 4 divisors (see below), whose sum is σ = 2599524. Its totient is φ = 1733008.

The previous prime is 2166251. The next prime is 2166289. The reversal of 2166265 is 5626612.

2166265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1687401 + 478864 = 1299^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166265 - 2⁵ = 2166233 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216622 + ... + 216631.

It is an arithmetic number, because the mean of its divisors is an integer number (649881).

2^2166265 is an apocalyptic number.

It is an amenable number.

2166265 is a deficient number, since it is larger than the sum of its proper divisors (433259).

2166265 is an equidigital number, since it uses as much as digits as its factorization.

2166265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433258.

The product of its digits is 4320, while the sum is 28.

The square root of 2166265 is about 1471.8236986813. The cubic root of 2166265 is about 129.3909379262.

The spelling of 2166265 in words is "two million, one hundred sixty-six thousand, two hundred sixty-five".