6,561.
Yes, it can and it is.
27....
81 is einundachtzig in German.
quatre vingt-un
0.081
Not sure if you mean eight sq yards or eightyone. 1 sq yard = 9 sq ft, so result is either 72 or 729
the answer is 64,023,737,057,280,000.
1358954496
24
512
If you're on a computer that allows you to ask this question and see the answer, it undoubtedly has a calculator program (in Windows, it's calc.exe). So you can answer this for yourself.
8 times 8 times 8 times 8 times 8 times 8, or 86 is 262,144