6664566 has 16 divisors (see below), whose sum is σ = 13759488. Its totient is φ = 2149800.

The previous prime is 6664547. The next prime is 6664571. The reversal of 6664566 is 6654666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17730 + ... + 18101.

It is an arithmetic number, because the mean of its divisors is an integer number (859968).

Almost surely, 2^6664566 is an apocalyptic number.

6664566 is an abundant number, since it is smaller than the sum of its proper divisors (7094922).

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

6664566 is a wasteful number, since it uses less digits than its factorization.

6664566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35867.

The product of its digits is 155520, while the sum is 39.

The square root of 6664566 is about 2581.5820730707. The cubic root of 6664566 is about 188.1874356694.

The spelling of 6664566 in words is "six million, six hundred sixty-four thousand, five hundred sixty-six".