6666845 has 8 divisors (see below), whose sum is σ = 8216664. Its totient is φ = 5189184.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666845 is 5486666.

It can be written as a sum of positive squares in 4 ways, for example, as 649636 + 6017209 = 806^2 + 2453^2 .

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 6666845 - 2² = 6666841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666841) 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, 17834 + ... + 18203.

It is an arithmetic number, because the mean of its divisors is an integer number (1027083).

Almost surely, 2^6666845 is an apocalyptic number.

It is an amenable number.

6666845 is a deficient number, since it is larger than the sum of its proper divisors (1549819).

6666845 is a wasteful number, since it uses less digits than its factorization.

6666845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36079.

The product of its digits is 207360, while the sum is 41.

The square root of 6666845 is about 2582.0234313422. The cubic root of 6666845 is about 188.2088839422.

The spelling of 6666845 in words is "six million, six hundred sixty-six thousand, eight hundred forty-five".