6668809 has 4 divisors (see below), whose sum is σ = 7621504. Its totient is φ = 5716116.

The previous prime is 6668807. The next prime is 6668821. The reversal of 6668809 is 9088666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6668809 - 2¹ = 6668807 is a prime.

It is a Duffinian number.

6668809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6668807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476337 + ... + 476350.

It is an arithmetic number, because the mean of its divisors is an integer number (1905376).

Almost surely, 2^6668809 is an apocalyptic number.

It is an amenable number.

6668809 is a deficient number, since it is larger than the sum of its proper divisors (952695).

6668809 is an equidigital number, since it uses as much as digits as its factorization.

6668809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952694.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6668809 is about 2582.4037252142. The cubic root of 6668809 is about 188.2273637456.

The spelling of 6668809 in words is "six million, six hundred sixty-eight thousand, eight hundred nine".