6646085 has 4 divisors (see below), whose sum is σ = 7975308. Its totient is φ = 5316864.

The previous prime is 6646049. The next prime is 6646153. The reversal of 6646085 is 5806466.

It is a Cunningham number, because it is equal to 2578²+1.

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 2390116 + 4255969 = 1546^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646085 - 2²² = 2451781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 664604 + ... + 664613.

It is an arithmetic number, because the mean of its divisors is an integer number (1993827).

Almost surely, 2^6646085 is an apocalyptic number.

It is an amenable number.

6646085 is a deficient number, since it is larger than the sum of its proper divisors (1329223).

6646085 is a wasteful number, since it uses less digits than its factorization.

6646085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329222.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 6646085 is about 2578.0001939488. Note that the first 3 decimals coincide. The cubic root of 6646085 is about 188.0133252212.

The spelling of 6646085 in words is "six million, six hundred forty-six thousand, eighty-five".