6556664 has 8 divisors (see below), whose sum is σ = 12293760. Its totient is φ = 3278328.

The previous prime is 6556657. The next prime is 6556673. The reversal of 6556664 is 4666556.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 409784 + ... + 409799.

It is an arithmetic number, because the mean of its divisors is an integer number (1536720).

Almost surely, 2^6556664 is an apocalyptic number.

It is an amenable number.

6556664 is a deficient number, since it is larger than the sum of its proper divisors (5737096).

6556664 is a wasteful number, since it uses less digits than its factorization.

6556664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819589 (or 819585 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 6556664 is about 2560.5983675696. The cubic root of 6556664 is about 187.1662947329.

The spelling of 6556664 in words is "six million, five hundred fifty-six thousand, six hundred sixty-four".