6564666 has 16 divisors (see below), whose sum is σ = 13154688. Its totient is φ = 2184000.

The previous prime is 6564661. The next prime is 6564667. The reversal of 6564666 is 6664656.

It is not an unprimeable number, because it can be changed into a prime (6564661) by changing a digit.

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, 4866 + ... + 6066.

It is an arithmetic number, because the mean of its divisors is an integer number (822168).

Almost surely, 2^6564666 is an apocalyptic number.

6564666 is an abundant number, since it is smaller than the sum of its proper divisors (6590022).

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

6564666 is a wasteful number, since it uses less digits than its factorization.

6564666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117.

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

The square root of 6564666 is about 2562.1604165235. The cubic root of 6564666 is about 187.2424053799.

The spelling of 6564666 in words is "six million, five hundred sixty-four thousand, six hundred sixty-six".