6665864 has 16 divisors (see below), whose sum is σ = 12530700. Its totient is φ = 3324352.

The previous prime is 6665861. The next prime is 6665873. The reversal of 6665864 is 4685666.

6665864 is digitally balanced in base 5, 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 2 ways, for example, as 6543364 + 122500 = 2558^2 + 350^2 .

It is not an unprimeable number, because it can be changed into a prime (6665861) 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 3 ways as a sum of consecutive naturals, for example, 3254 + ... + 4890.

Almost surely, 2^6665864 is an apocalyptic number.

It is an amenable number.

6665864 is a deficient number, since it is larger than the sum of its proper divisors (5864836).

6665864 is a wasteful number, since it uses less digits than its factorization.

6665864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152 (or 2148 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 6665864 is about 2581.8334570611. The cubic root of 6665864 is about 188.1996520905.

The spelling of 6665864 in words is "six million, six hundred sixty-five thousand, eight hundred sixty-four".