666850 has 12 divisors (see below), whose sum is σ = 1240434. Its totient is φ = 266720.

The previous prime is 666829. The next prime is 666857. The reversal of 666850 is 58666.

It can be written as a sum of positive squares in 3 ways, for example, as 423801 + 243049 = 651^2 + 493^2 .

It is not an unprimeable number, because it can be changed into a prime (666857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6619 + ... + 6718.

2⁶⁶⁶⁸⁵⁰ is an apocalyptic number.

666850 is a deficient number, since it is larger than the sum of its proper divisors (573584).

666850 is a wasteful number, since it uses less digits than its factorization.

666850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13349 (or 13344 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 666850 is about 816.6088414902. The cubic root of 666850 is about 87.3660535606.

The spelling of 666850 in words is "six hundred sixty-six thousand, eight hundred fifty".