6668917 has 4 divisors (see below), whose sum is σ = 6849196. Its totient is φ = 6488640.

The previous prime is 6668911. The next prime is 6668939. The reversal of 6668917 is 7198666.

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 2692881 + 3976036 = 1641^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668917 - 2⁷ = 6668789 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 (6668911) 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, 90084 + ... + 90157.

It is an arithmetic number, because the mean of its divisors is an integer number (1712299).

Almost surely, 2^6668917 is an apocalyptic number.

It is an amenable number.

6668917 is a deficient number, since it is larger than the sum of its proper divisors (180279).

6668917 is a wasteful number, since it uses less digits than its factorization.

6668917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180278.

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

The square root of 6668917 is about 2582.4246358800. The cubic root of 6668917 is about 188.2283798414.

The spelling of 6668917 in words is "six million, six hundred sixty-eight thousand, nine hundred seventeen".