6668815 has 8 divisors (see below), whose sum is σ = 8039808. Its totient is φ = 5310240.

The previous prime is 6668807. The next prime is 6668821. The reversal of 6668815 is 5188666.

It is a happy number.

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

It is not a de Polignac number, because 6668815 - 2³ = 6668807 is a prime.

It is a Duffinian number.

6668815 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 1876 + ... + 4105.

It is an arithmetic number, because the mean of its divisors is an integer number (1004976).

Almost surely, 2^6668815 is an apocalyptic number.

6668815 is a deficient number, since it is larger than the sum of its proper divisors (1370993).

6668815 is a wasteful number, since it uses less digits than its factorization.

6668815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209.

The product of its digits is 69120, while the sum is 40.

The square root of 6668815 is about 2582.4048869223. The cubic root of 6668815 is about 188.2274201957.

The spelling of 6668815 in words is "six million, six hundred sixty-eight thousand, eight hundred fifteen".