https://decimal-to-binary.com/volume-cilindr.html?id=4

Cylinder volume with height h = 5000000000000000000 and the radius of the base r = 999999999999 equal 1.5707499999969E+43

Method for calculating cylinder volume
Height h: Radius r:

Cylinder

A cylinder is a geometric body closed between two parallel bases that are circles.
Cylinder volume formula: Cylinder volume formula by height and base radius where h is the height of the cylinder,r is the radius of the base

Solution:
V = π·r2 · h
= π·9999999999992 · 5000000000000000000
= π·9.99999999998E+23 · 5000000000000000000
= 4.99999999999E+42·π
=
1.5707499999969E+43

a: Cylinder volume with height h = 5000000000000000000 and the radius of the base r = 999999999999 equal 1.5707499999969E+43