6556668 has 48 divisors (see below), whose sum is σ = 16087680. Its totient is φ = 2075584.

The previous prime is 6556657. The next prime is 6556673. The reversal of 6556668 is 8666556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28771 + ... + 28997.

It is an arithmetic number, because the mean of its divisors is an integer number (335160).

Almost surely, 2^6556668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6556668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8043840).

6556668 is an abundant number, since it is smaller than the sum of its proper divisors (9531012).

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

6556668 is a wasteful number, since it uses less digits than its factorization.

6556668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 344 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 6556668 is about 2560.5991486369. The cubic root of 6556668 is about 187.1663327942.

The spelling of 6556668 in words is "six million, five hundred fifty-six thousand, six hundred sixty-eight".