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.