Volume of the Sun in Cubic Inches
There are 12 x 12 x 12 x 5280 x 5280 x 5280 cubic inches in a single cubic mile.
This equals 2.54 x 10¹⁴ cubic inches.
The number of cubic miles in the sun is calculated in 10¹⁵ and is 3.4 x 10¹⁷.
Multiply the two: 2.54 x 3.4 x 10¹⁴ x 10¹⁷.
The result is 8.6 x 10³¹.