How tall in miles would a stack of 4.5 billion pennies be?

Answer 1

According to Wikipedia, a U.S. penny is 0.061 in. thick.

Multiply: 0.061 * 4,500,000,000 = ?

Then convert those inches into miles.

Note: 12 in. = 1 foot
5,280 feet = 1 mile

Answer 2

51,988.63 repeated