The answer depends on 6.5 million what, and in what units. A stack in 50 pounds notes will be different from a stack for the same amount in 1 penny coins.
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17 million one-dollar bills would stack to about 6,091.67 feet high.
One million 1-dollar bills would be about 358.33 feet tall.
That would be 4300 inches -about a s high as a 35 story building
Based on the research done here (http://www.cockeyed.com/inside/million/million.html) A million dollars worth of $100 bills makes a stack about 40 inches high! If you do the math, that means a Billion is 3,333 feet high and a trillion dollars would make a stack over 3 million feet tall or roughly 630 miles high!!!
A US penny is 1.55mm thick. Thus a stack of 1,000,000 pennies would be 1,550,000mm, or 1.55 kilometers (0.963 miles) high. A Canadian penny is 1.45mm thick. Thus a stack of 1,000,000 pennies would be 1,450,000mm, or 1.55 kilometers (0.901 miles) high. A post-1992 British penny is 1.65mm thick. Thus a stack of 1,000,000 pennies would be 1,650,000mm, or 1.65 kilometers (1.025 miles) high.