6659543 has 4 divisors (see below), whose sum is σ = 7264968. Its totient is φ = 6054120.

The previous prime is 6659501. The next prime is 6659561. The reversal of 6659543 is 3459566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6659543 - 2⁸ = 6659287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6659497 and 6659506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302696 + ... + 302717.

It is an arithmetic number, because the mean of its divisors is an integer number (1816242).

Almost surely, 2^6659543 is an apocalyptic number.

6659543 is a deficient number, since it is larger than the sum of its proper divisors (605425).

6659543 is a wasteful number, since it uses less digits than its factorization.

6659543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605424.

The product of its digits is 97200, while the sum is 38.

The square root of 6659543 is about 2580.6090366423. The cubic root of 6659543 is about 188.1401456149.

The spelling of 6659543 in words is "six million, six hundred fifty-nine thousand, five hundred forty-three".