6520665 has 16 divisors (see below), whose sum is σ = 10528128. Its totient is φ = 3446016.

The previous prime is 6520609. The next prime is 6520691. The reversal of 6520665 is 5660256.

It is not a de Polignac number, because 6520665 - 2⁹ = 6520153 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 3618.

It is an arithmetic number, because the mean of its divisors is an integer number (658008).

Almost surely, 2^6520665 is an apocalyptic number.

It is an amenable number.

6520665 is a deficient number, since it is larger than the sum of its proper divisors (4007463).

6520665 is a wasteful number, since it uses less digits than its factorization.

6520665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 6520665 is about 2553.5592806904. The cubic root of 6520665 is about 186.8231238578.

The spelling of 6520665 in words is "six million, five hundred twenty thousand, six hundred sixty-five".