(6^2)^3

http://www.google.com/#hl=en&sugexp=ldymls&xhr=t&q=(6%5E2)%5E3&cp=7&pf=p&sclient=psy&aq=0&aqi=&aql=&oq=(6%5E2)%5E3&pbx=1&fp=46c434222b5f0e70