Let's calculate 66790221 x 80666740
66790221 × 80666740 = 80666740 × (66790221)
+ 80666740 × 1 that equals 80666740
+ 80666740 × 20 that equals 1613334800
+ 80666740 × 200 that is equal 16133348000
+ 80666740 × 0000 yielding 0
+ 80666740 × 90000 which equals 7260006600000
+ 80666740 × 700000 yielding 56466718000000
+ 80666740 × 6000000 giving us 484000440000000
+ 80666740 × 60000000 resulting in 4840004400000000

= 5387749391949540
