6668904409 has 4 divisors (see below), whose sum is σ = 6898866660. Its totient is φ = 6438942160.

The previous prime is 6668904391. The next prime is 6668904421. The reversal of 6668904409 is 9044098666.

6668904409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1680590025 + 4988314384 = 40995^2 + 70628^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668904409 - 2⁹ = 6668903897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668904439) 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, 114981082 + ... + 114981139.

It is an arithmetic number, because the mean of its divisors is an integer number (1724716665).

Almost surely, 2^6668904409 is an apocalyptic number.

It is an amenable number.

6668904409 is a deficient number, since it is larger than the sum of its proper divisors (229962251).

6668904409 is a wasteful number, since it uses less digits than its factorization.

6668904409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229962250.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The square root of 6668904409 is about 81663.3602602783. The cubic root of 6668904409 is about 1882.2826138212.

The spelling of 6668904409 in words is "six billion, six hundred sixty-eight million, nine hundred four thousand, four hundred nine".