409808666 has 8 divisors (see below), whose sum is σ = 615051360. Its totient is φ = 204791548.

The previous prime is 409808627. The next prime is 409808683. The reversal of 409808666 is 666808904.

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

It is a self number, because there is not a number n which added to its sum of digits gives 409808666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51776 + ... + 59163.

It is an arithmetic number, because the mean of its divisors is an integer number (76881420).

Almost surely, 2^409808666 is an apocalyptic number.

409808666 is a deficient number, since it is larger than the sum of its proper divisors (205242694).

409808666 is a wasteful number, since it uses less digits than its factorization.

409808666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112788.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 409808666 is about 20243.7315236100. The cubic root of 409808666 is about 742.7803041790.

The spelling of 409808666 in words is "four hundred nine million, eight hundred eight thousand, six hundred sixty-six".