6665856 has 32 divisors (see below), whose sum is σ = 17707200. Its totient is φ = 2221824.

The previous prime is 6665843. The next prime is 6665861. The reversal of 6665856 is 6585666.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8296 + ... + 9063.

It is an arithmetic number, because the mean of its divisors is an integer number (553350).

Almost surely, 2^6665856 is an apocalyptic number.

It is an amenable number.

6665856 is an abundant number, since it is smaller than the sum of its proper divisors (11041344).

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

6665856 is a wasteful number, since it uses less digits than its factorization.

6665856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17376 (or 17364 counting only the distinct ones).

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

The square root of 6665856 is about 2581.8319077740. The cubic root of 6665856 is about 188.1995768016.

The spelling of 6665856 in words is "six million, six hundred sixty-five thousand, eight hundred fifty-six".