6630665 has 4 divisors (see below), whose sum is σ = 7956804. Its totient is φ = 5304528.

The previous prime is 6630661. The next prime is 6630691. The reversal of 6630665 is 5660366.

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 1666681 + 4963984 = 1291^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 6630665 - 2² = 6630661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6630661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663062 + ... + 663071.

It is an arithmetic number, because the mean of its divisors is an integer number (1989201).

Almost surely, 2^6630665 is an apocalyptic number.

It is an amenable number.

6630665 is a deficient number, since it is larger than the sum of its proper divisors (1326139).

6630665 is a wasteful number, since it uses less digits than its factorization.

6630665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326138.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 6630665 is about 2575.0077669786. The cubic root of 6630665 is about 187.8678054378.

Subtracting from 6630665 its reverse (5660366), we obtain a cube (970299 = 99³).

The spelling of 6630665 in words is "six million, six hundred thirty thousand, six hundred sixty-five".