6505565 has 12 divisors (see below), whose sum is σ = 8581692. Its totient is φ = 4730880.

The previous prime is 6505559. The next prime is 6505607. The reversal of 6505565 is 5655056.

It can be written as a sum of positive squares in 2 ways, for example, as 4553956 + 1951609 = 2134^2 + 1397^2 .

It is not a de Polignac number, because 6505565 - 2⁴ = 6505549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4772 + ... + 5981.

It is an arithmetic number, because the mean of its divisors is an integer number (715141).

Almost surely, 2^6505565 is an apocalyptic number.

It is an amenable number.

6505565 is a deficient number, since it is larger than the sum of its proper divisors (2076127).

6505565 is a wasteful number, since it uses less digits than its factorization.

6505565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10780 (or 10769 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 6505565 is about 2550.6009095897. The cubic root of 6505565 is about 186.6788027115.

The spelling of 6505565 in words is "six million, five hundred five thousand, five hundred sixty-five".