6668445 has 32 divisors (see below), whose sum is σ = 12499200. Its totient is φ = 2972160.

The previous prime is 6668429. The next prime is 6668447. The reversal of 6668445 is 5448666.

It is not a de Polignac number, because 6668445 - 2⁴ = 6668429 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668447) 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 31 ways as a sum of consecutive naturals, for example, 3531 + ... + 5079.

It is an arithmetic number, because the mean of its divisors is an integer number (390600).

Almost surely, 2^6668445 is an apocalyptic number.

It is an amenable number.

6668445 is a deficient number, since it is larger than the sum of its proper divisors (5830755).

6668445 is a wasteful number, since it uses less digits than its factorization.

6668445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605.

The product of its digits is 138240, while the sum is 39.

The square root of 6668445 is about 2582.3332472785. Note that the first 3 decimals coincide. The cubic root of 6668445 is about 188.2239390458.

The spelling of 6668445 in words is "six million, six hundred sixty-eight thousand, four hundred forty-five".