What would you do with seventeen quintillion dollars?

If I had seventeen quintillion dollars, I’d cash it in at the bank for pennies just so the resulting mass of pennies would create a black hole.
Okay.
Black hole math is hard for me.

And I don’t know the Schwarzschild radius of a mass of pennies in space.

But if I got things correct, 17 quintillion pennies isn’t even nearly the mass of the earth.

Too many pennies ≈ 4.25 x 10^16kg.
Earth ≈ 5.97 x 10^24kg.
Sun ≈ 1.99 x 10^30kg.
Sagittarius A* ≈ 8.26 x 10^36kg.
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@ziphi it would actually be 4.25·10¹⁸ kg, 17 quintillion dollars is 1.7 sextillion pennies
-F

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