6644543 has 2 divisors, whose sum is σ = 6644544. Its totient is φ = 6644542.

The previous prime is 6644537. The next prime is 6644549. The reversal of 6644543 is 3454466.

It is a balanced prime because it is at equal distance from previous prime (6644537) and next prime (6644549).

It is a cyclic number.

It is not a de Polignac number, because 6644543 - 2⁴ = 6644527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6644549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322271 + 3322272.

It is an arithmetic number, because the mean of its divisors is an integer number (3322272).

Almost surely, 2^6644543 is an apocalyptic number.

6644543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644543 is an equidigital number, since it uses as much as digits as its factorization.

6644543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 32.

The square root of 6644543 is about 2577.7011075763. The cubic root of 6644543 is about 187.9987833783.

The spelling of 6644543 in words is "six million, six hundred forty-four thousand, five hundred forty-three".