2665623 has 4 divisors (see below), whose sum is σ = 3554168. Its totient is φ = 1777080.

The previous prime is 2665601. The next prime is 2665627. The reversal of 2665623 is 3265662.

2665623 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 is not a de Polignac number, because 2665623 - 2⁸ = 2665367 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665627) by changing a digit.

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, 444268 + ... + 444273.

It is an arithmetic number, because the mean of its divisors is an integer number (888542).

2^2665623 is an apocalyptic number.

2665623 is a deficient number, since it is larger than the sum of its proper divisors (888545).

2665623 is an equidigital number, since it uses as much as digits as its factorization.

2665623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888544.

The product of its digits is 12960, while the sum is 30.

The square root of 2665623 is about 1632.6735742334. The cubic root of 2665623 is about 138.6541615582.

The spelling of 2665623 in words is "two million, six hundred sixty-five thousand, six hundred twenty-three".