666214 has 4 divisors (see below), whose sum is σ = 999324. Its totient is φ = 333106.

The previous prime is 666203. The next prime is 666229. The reversal of 666214 is 412666.

It is a happy number.

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

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166552 + ... + 166555.

It is an arithmetic number, because the mean of its divisors is an integer number (249831).

2⁶⁶⁶²¹⁴ is an apocalyptic number.

666214 is a deficient number, since it is larger than the sum of its proper divisors (333110).

666214 is a wasteful number, since it uses less digits than its factorization.

666214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333109.

The product of its digits is 1728, while the sum is 25.

The square root of 666214 is about 816.2193332677. The cubic root of 666214 is about 87.3382699590.

The spelling of 666214 in words is "six hundred sixty-six thousand, two hundred fourteen".