6856566 has 12 divisors (see below), whose sum is σ = 13725972. Its totient is φ = 2283384.

The previous prime is 6856561. The next prime is 6856573. The reversal of 6856566 is 6656586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5880 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (1143831).

Almost surely, 2^6856566 is an apocalyptic number.

6856566 is an abundant number, since it is smaller than the sum of its proper divisors (6869406).

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

6856566 is an equidigital number, since it uses as much as digits as its factorization.

6856566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 1074 counting only the distinct ones).

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

The square root of 6856566 is about 2618.5045350352. The cubic root of 6856566 is about 189.9775227334.

The spelling of 6856566 in words is "six million, eight hundred fifty-six thousand, five hundred sixty-six".