If I was the 6th Ranger, I would probably say either ability to fly or ability to be invisible.
Because they're twins, and appeared on the show at the same time, either Gem and Gemma can be considered to be the sixth Ranger.
99 to the sixth power is 941,480,149,401
nine to the sixth power is 531441.
25 to the sixth power equates to 244,140,625
1.028 to the sixth power is 1.18020836358(rounded).
0.3 to the sixth power equals 0.000729
27 to the sixth power equals 387,420,489
Five to the negative sixth power equals 0.000064
-1 to the sixth power equals one.
91,000,000
Two to the sixth power = 64
Two to the sixth power equals 64.