2665665 has 24 divisors (see below), whose sum is σ = 4748328. Its totient is φ = 1382400.

The previous prime is 2665627. The next prime is 2665667. The reversal of 2665665 is 5665662.

It can be written as a sum of positive squares in 4 ways, for example, as 1679616 + 986049 = 1296^2 + 993^2 .

It is not a de Polignac number, because 2665665 - 2⁶ = 2665601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865 + ... + 2465.

It is an arithmetic number, because the mean of its divisors is an integer number (197847).

2^2665665 is an apocalyptic number.

It is an amenable number.

2665665 is a deficient number, since it is larger than the sum of its proper divisors (2082663).

2665665 is a wasteful number, since it uses less digits than its factorization.

2665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649 (or 1646 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 2665665 is about 1632.6864365211. The cubic root of 2665665 is about 138.6548897738.

The spelling of 2665665 in words is "two million, six hundred sixty-five thousand, six hundred sixty-five".