6646866 has 8 divisors (see below), whose sum is σ = 13293744. Its totient is φ = 2215620.

The previous prime is 6646859. The next prime is 6646867. The reversal of 6646866 is 6686466.

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

6646866 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6646867) 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, 553900 + ... + 553911.

It is an arithmetic number, because the mean of its divisors is an integer number (1661718).

Almost surely, 2^6646866 is an apocalyptic number.

6646866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6646866 is a wasteful number, since it uses less digits than its factorization.

6646866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107816.

The product of its digits is 248832, while the sum is 42.

The square root of 6646866 is about 2578.1516634985. The cubic root of 6646866 is about 188.0206895896.

The spelling of 6646866 in words is "six million, six hundred forty-six thousand, eight hundred sixty-six".