6505566 has 16 divisors (see below), whose sum is σ = 13206144. Its totient is φ = 2136024.

The previous prime is 6505559. The next prime is 6505607. The reversal of 6505566 is 6655056.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 7690 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (825384).

Almost surely, 2^6505566 is an apocalyptic number.

6505566 is an abundant number, since it is smaller than the sum of its proper divisors (6700578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6505566 is a wasteful number, since it uses less digits than its factorization.

6505566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16255.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 6505566 is about 2550.6011056220. The cubic root of 6505566 is about 186.6788122766.

It can be divided in two parts, 650 and 5566, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 6505566 in words is "six million, five hundred five thousand, five hundred sixty-six".