6643085 has 4 divisors (see below), whose sum is σ = 7971708. Its totient is φ = 5314464.

The previous prime is 6643069. The next prime is 6643097. The reversal of 6643085 is 5803466.

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 4609609 + 2033476 = 2147^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643085 - 2⁴ = 6643069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664304 + ... + 664313.

It is an arithmetic number, because the mean of its divisors is an integer number (1992927).

Almost surely, 2^6643085 is an apocalyptic number.

It is an amenable number.

6643085 is a deficient number, since it is larger than the sum of its proper divisors (1328623).

6643085 is a wasteful number, since it uses less digits than its factorization.

6643085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328622.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6643085 is about 2577.4182819248. The cubic root of 6643085 is about 187.9850316285.

The spelling of 6643085 in words is "six million, six hundred forty-three thousand, eighty-five".