2645665 has 12 divisors (see below), whose sum is σ = 3490452. Its totient is φ = 1923680.

The previous prime is 2645663. The next prime is 2645681. The reversal of 2645665 is 5665462.

It can be written as a sum of positive squares in 2 ways, for example, as 1234321 + 1411344 = 1111^2 + 1188^2 .

It is not a de Polignac number, because 2645665 - 2¹ = 2645663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2645665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645663) 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, 1582 + ... + 2791.

It is an arithmetic number, because the mean of its divisors is an integer number (290871).

2^2645665 is an apocalyptic number.

It is an amenable number.

2645665 is a deficient number, since it is larger than the sum of its proper divisors (844787).

2645665 is a wasteful number, since it uses less digits than its factorization.

2645665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400 (or 4389 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 2645665 is about 1626.5500299714. The cubic root of 2645665 is about 138.3072514173.

It can be divided in two parts, 264 and 5665, that added together give a square (5929 = 77²).

The spelling of 2645665 in words is "two million, six hundred forty-five thousand, six hundred sixty-five".