2665649 has 6 divisors (see below), whose sum is σ = 3100914. Its totient is φ = 2284800.

The previous prime is 2665627. The next prime is 2665667. The reversal of 2665649 is 9465662.

It can be written as a sum of positive squares in only one way, i.e., 2458624 + 207025 = 1568^2 + 455^2 .

It is not a de Polignac number, because 2665649 - 2¹² = 2661553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27152 + ... + 27249.

It is an arithmetic number, because the mean of its divisors is an integer number (516819).

2^2665649 is an apocalyptic number.

It is an amenable number.

2665649 is a deficient number, since it is larger than the sum of its proper divisors (435265).

2665649 is an equidigital number, since it uses as much as digits as its factorization.

2665649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54415 (or 54408 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 2665649 is about 1632.6815366139. The cubic root of 2665649 is about 138.6546123592.

The spelling of 2665649 in words is "two million, six hundred sixty-five thousand, six hundred forty-nine".