6.626 x 10¯34*5.93×10^172
Do you mean
$$6.626*10^{34}*5.93*10^{172} \\ =6.626*5.93*10^{34+172}\\ =39.29218*10^{206}\\ =3.929218*10^{207}\\$$
(6.626*5.93) * 10^ (172-34)
(6.626*5.93) * 10^ 138
(39.29218) * 10^138
(3.929218)/10 * 10^138
(3.929218) * 10^137
ANSWER : 3.929218 * 10^137.