6686865 has 24 divisors (see below), whose sum is σ = 12273768. Its totient is φ = 3356160.

The previous prime is 6686861. The next prime is 6686893. The reversal of 6686865 is 5686866.

6686865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 576081 + 6110784 = 759^2 + 2472^2 .

It is not a de Polignac number, because 6686865 - 2² = 6686861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6686865.

It is not an unprimeable number, because it can be changed into a prime (6686861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3606 + ... + 5135.

It is an arithmetic number, because the mean of its divisors is an integer number (511407).

Almost surely, 2^6686865 is an apocalyptic number.

It is an amenable number.

6686865 is a deficient number, since it is larger than the sum of its proper divisors (5586903).

6686865 is a wasteful number, since it uses less digits than its factorization.

6686865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8769 (or 8766 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 6686865 is about 2585.8973297484. The cubic root of 6686865 is about 188.3970877341.

Subtracting from 6686865 its reverse (5686866), we obtain a palindrome (999999).

The spelling of 6686865 in words is "six million, six hundred eighty-six thousand, eight hundred sixty-five".