6656865 has 8 divisors (see below), whose sum is σ = 10651008. Its totient is φ = 3550320.

The previous prime is 6656861. The next prime is 6656879. The reversal of 6656865 is 5686566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6656865 - 2² = 6656861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6656861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221881 + ... + 221910.

It is an arithmetic number, because the mean of its divisors is an integer number (1331376).

Almost surely, 2^6656865 is an apocalyptic number.

It is an amenable number.

6656865 is a deficient number, since it is larger than the sum of its proper divisors (3994143).

6656865 is a wasteful number, since it uses less digits than its factorization.

6656865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443799.

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

The square root of 6656865 is about 2580.0901147053. The cubic root of 6656865 is about 188.1149233206.

Subtracting from 6656865 its reverse (5686566), we obtain a cube (970299 = 99³).

The spelling of 6656865 in words is "six million, six hundred fifty-six thousand, eight hundred sixty-five".