6645859 has 8 divisors (see below), whose sum is σ = 7283952. Its totient is φ = 6013440.

The previous prime is 6645857. The next prime is 6645871. The reversal of 6645859 is 9585466.

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 6645859 - 2¹ = 6645857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645851) 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 7 ways as a sum of consecutive naturals, for example, 1267 + ... + 3859.

It is an arithmetic number, because the mean of its divisors is an integer number (910494).

Almost surely, 2^6645859 is an apocalyptic number.

6645859 is a deficient number, since it is larger than the sum of its proper divisors (638093).

6645859 is a wasteful number, since it uses less digits than its factorization.

6645859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837.

The product of its digits is 259200, while the sum is 43.

The square root of 6645859 is about 2577.9563611512. The cubic root of 6645859 is about 188.0111940671.

The spelling of 6645859 in words is "six million, six hundred forty-five thousand, eight hundred fifty-nine".