6643375 has 8 divisors (see below), whose sum is σ = 8291088. Its totient is φ = 5314600.

The previous prime is 6643361. The next prime is 6643381. The reversal of 6643375 is 5733466.

It is not a de Polignac number, because 6643375 - 2⁹ = 6642863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6643375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26449 + ... + 26698.

It is an arithmetic number, because the mean of its divisors is an integer number (1036386).

Almost surely, 2^6643375 is an apocalyptic number.

6643375 is a deficient number, since it is larger than the sum of its proper divisors (1647713).

6643375 is an equidigital number, since it uses as much as digits as its factorization.

6643375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53162 (or 53152 counting only the distinct ones).

The product of its digits is 45360, while the sum is 34.

The square root of 6643375 is about 2577.4745391565. The cubic root of 6643375 is about 187.9877670477.

Subtracting from 6643375 its reverse (5733466), we obtain a palindrome (909909).

The spelling of 6643375 in words is "six million, six hundred forty-three thousand, three hundred seventy-five".