6645243 has 16 divisors (see below), whose sum is σ = 9792000. Its totient is φ = 3974880.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645243 is 3425466.

It is an interprime number because it is at equal distance from previous prime (6645227) and next prime (6645259).

It is not a de Polignac number, because 6645243 - 2⁴ = 6645227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6645243.

It is not an unprimeable number, because it can be changed into a prime (6645293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1333 + ... + 3881.

It is an arithmetic number, because the mean of its divisors is an integer number (612000).

Almost surely, 2^6645243 is an apocalyptic number.

6645243 is a deficient number, since it is larger than the sum of its proper divisors (3146757).

6645243 is a wasteful number, since it uses less digits than its factorization.

6645243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642.

The product of its digits is 17280, while the sum is 30.

The square root of 6645243 is about 2577.8368839009. The cubic root of 6645243 is about 188.0053850125.

The spelling of 6645243 in words is "six million, six hundred forty-five thousand, two hundred forty-three".