666197 has 8 divisors (see below), whose sum is σ = 801600. Its totient is φ = 540864.

The previous prime is 666191. The next prime is 666203. The reversal of 666197 is 791666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666191) and next prime (666203).

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

It is a cyclic number.

It is not a de Polignac number, because 666197 - 2¹⁴ = 649813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2372 + ... + 2637.

It is an arithmetic number, because the mean of its divisors is an integer number (100200).

2⁶⁶⁶¹⁹⁷ is an apocalyptic number.

It is an amenable number.

666197 is a deficient number, since it is larger than the sum of its proper divisors (135403).

666197 is a wasteful number, since it uses less digits than its factorization.

666197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035.

The product of its digits is 13608, while the sum is 35.

The square root of 666197 is about 816.2089193338. The cubic root of 666197 is about 87.3375270730.

The spelling of 666197 in words is "six hundred sixty-six thousand, one hundred ninety-seven".