666814 has 8 divisors (see below), whose sum is σ = 1027368. Its totient is φ = 324360.

The previous prime is 666811. The next prime is 666821. The reversal of 666814 is 418666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4432 + ... + 4579.

It is an arithmetic number, because the mean of its divisors is an integer number (128421).

2⁶⁶⁶⁸¹⁴ is an apocalyptic number.

666814 is a deficient number, since it is larger than the sum of its proper divisors (360554).

666814 is a wasteful number, since it uses less digits than its factorization.

666814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050.

The product of its digits is 6912, while the sum is 31.

The square root of 666814 is about 816.5867988157. The cubic root of 666814 is about 87.3644813757.

The spelling of 666814 in words is "six hundred sixty-six thousand, eight hundred fourteen".