6666856 has 64 divisors (see below), whose sum is σ = 15552000. Its totient is φ = 2614272.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666856 is 6586666.

6666856 = T₆ + T₇ + ... + T₃₄₁.

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, 44670 + ... + 44818.

It is an arithmetic number, because the mean of its divisors is an integer number (243000).

Almost surely, 2^6666856 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 6666856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7776000).

6666856 is an abundant number, since it is smaller than the sum of its proper divisors (8885144).

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

6666856 is a wasteful number, since it uses less digits than its factorization.

6666856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 222 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 6666856 is about 2582.0255614536. The cubic root of 6666856 is about 188.2089874542.

The spelling of 6666856 in words is "six million, six hundred sixty-six thousand, eight hundred fifty-six".