6643045 has 8 divisors (see below), whose sum is σ = 8054424. Its totient is φ = 5259264.

The previous prime is 6643033. The next prime is 6643051. The reversal of 6643045 is 5403466.

It can be written as a sum of positive squares in 4 ways, for example, as 2116 + 6640929 = 46^2 + 2577^2 .

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 6643045 - 2⁷ = 6642917 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6364 + ... + 7333.

It is an arithmetic number, because the mean of its divisors is an integer number (1006803).

Almost surely, 2^6643045 is an apocalyptic number.

It is an amenable number.

6643045 is a deficient number, since it is larger than the sum of its proper divisors (1411379).

6643045 is a wasteful number, since it uses less digits than its factorization.

6643045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13799.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6643045 is about 2577.4105222102. The cubic root of 6643045 is about 187.9846543231.

The spelling of 6643045 in words is "six million, six hundred forty-three thousand, forty-five".