6656566 has 8 divisors (see below), whose sum is σ = 11411280. Its totient is φ = 2852808.

The previous prime is 6656561. The next prime is 6656569.

It is a happy number.

6656566 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656561) 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 3 ways as a sum of consecutive naturals, for example, 237721 + ... + 237748.

It is an arithmetic number, because the mean of its divisors is an integer number (1426410).

Almost surely, 2^6656566 is an apocalyptic number.

6656566 is a deficient number, since it is larger than the sum of its proper divisors (4754714).

6656566 is a wasteful number, since it uses less digits than its factorization.

6656566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475478.

The product of its digits is 194400, while the sum is 40.

The square root of 6656566 is about 2580.0321703421. The cubic root of 6656566 is about 188.1121068194.

The spelling of 6656566 in words is "six million, six hundred fifty-six thousand, five hundred sixty-six".