6668197 has 4 divisors (see below), whose sum is σ = 6713100. Its totient is φ = 6623296.

The previous prime is 6668171. The next prime is 6668203. The reversal of 6668197 is 7918666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1442401 + 5225796 = 1201^2 + 2286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6668197 is a prime.

It is a Duffinian number.

6668197 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22228 + ... + 22525.

It is an arithmetic number, because the mean of its divisors is an integer number (1678275).

Almost surely, 2^6668197 is an apocalyptic number.

It is an amenable number.

6668197 is a deficient number, since it is larger than the sum of its proper divisors (44903).

6668197 is a wasteful number, since it uses less digits than its factorization.

6668197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44902.

The product of its digits is 108864, while the sum is 43.

The square root of 6668197 is about 2582.2852282426. The cubic root of 6668197 is about 188.2216056625.

The spelling of 6668197 in words is "six million, six hundred sixty-eight thousand, one hundred ninety-seven".