6646543 has 2 divisors, whose sum is σ = 6646544. Its totient is φ = 6646542.

The previous prime is 6646513. The next prime is 6646559. The reversal of 6646543 is 3456466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6646543 - 2⁵ = 6646511 is a prime.

6646543 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6646499 and 6646508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646513) 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 as a sum of consecutive naturals, namely, 3323271 + 3323272.

It is an arithmetic number, because the mean of its divisors is an integer number (3323272).

Almost surely, 2^6646543 is an apocalyptic number.

6646543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646543 is an equidigital number, since it uses as much as digits as its factorization.

6646543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 34.

The square root of 6646543 is about 2578.0890209611. The cubic root of 6646543 is about 188.0176439605.

The spelling of 6646543 in words is "six million, six hundred forty-six thousand, five hundred forty-three".