6643305 has 12 divisors (see below), whose sum is σ = 11515140. Its totient is φ = 3543072.

The previous prime is 6643303. The next prime is 6643319. The reversal of 6643305 is 5033466.

It can be written as a sum of positive squares in 2 ways, for example, as 1390041 + 5253264 = 1179^2 + 2292^2 .

It is not a de Polignac number, because 6643305 - 2¹ = 6643303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6643303) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 73770 + ... + 73859.

It is an arithmetic number, because the mean of its divisors is an integer number (959595).

Almost surely, 2^6643305 is an apocalyptic number.

It is an amenable number.

6643305 is a deficient number, since it is larger than the sum of its proper divisors (4871835).

6643305 is a wasteful number, since it uses less digits than its factorization.

6643305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147640 (or 147637 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 6643305 is about 2577.4609599371. The cubic root of 6643305 is about 187.9871067814.

It can be divided in two parts, 664 and 3305, that added together give a square (3969 = 63²).

The spelling of 6643305 in words is "six million, six hundred forty-three thousand, three hundred five".