800008666 has 4 divisors (see below), whose sum is σ = 1200013002. Its totient is φ = 400004332.

The previous prime is 800008639. The next prime is 800008691. The reversal of 800008666 is 666800008.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 722480641 + 77528025 = 26879^2 + 8805^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200002165 + ... + 200002168.

Almost surely, 2^800008666 is an apocalyptic number.

800008666 is a deficient number, since it is larger than the sum of its proper divisors (400004336).

800008666 is a wasteful number, since it uses less digits than its factorization.

800008666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400004335.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 800008666 is about 28284.4244417312. The cubic root of 800008666 is about 928.3211187112.

The spelling of 800008666 in words is "eight hundred million, eight thousand, six hundred sixty-six".