You can write it as
41 or 22 or 160.5 or 82/3 and so on.
4 to the power of 5
4 to the second power
43
45
41
7x10 to the power of -4
4 then tiny 2
10-4
4^(5)
6.3*10power of 4
Four to the third power (43) is the same as 4 x 4 x 4 or 64
245 = 2.45 × 102