806666 has 16 divisors (see below), whose sum is σ = 1395456. Its totient is φ = 342576.

The previous prime is 806657. The next prime is 806671. The reversal of 806666 is 666608.

It is a happy number.

806666 is a modest number, since divided by 6666 gives 80 as remainder.

It is an unprimeable number.

806666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (87216).

2⁸⁰⁶⁶⁶⁶ is an apocalyptic number.

806666 is a deficient number, since it is larger than the sum of its proper divisors (588790).

806666 is a wasteful number, since it uses less digits than its factorization.

806666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 806666 is about 898.1458678856. The cubic root of 806666 is about 93.0889040775.

The spelling of 806666 in words is "eight hundred six thousand, six hundred sixty-six".