Alright, let's work through 66998991 times 36163753 step by step
66998991 × 36163753 = 36163753 × (66998991)
+ 36163753 × 1 that results in 36163753
+ 36163753 × 90 that equals 3254737770
+ 36163753 × 900 which equals 32547377700
+ 36163753 × 8000 resulting in 289310024000
+ 36163753 × 90000 that equals 3254737770000
+ 36163753 × 900000 giving us 32547377700000
+ 36163753 × 6000000 that results in 216982518000000
+ 36163753 × 60000000 producing 2169825180000000

= 2422934961773223
