Alright, let's work through 64099913 times 20223099 step by step
64099913 × 20223099 = 20223099 × (64099913)
+ 20223099 × 3 that equals 60669297
+ 20223099 × 10 that results in 202230990
+ 20223099 × 900 yielding 18200789100
+ 20223099 × 9000 yielding 182007891000
+ 20223099 × 90000 that equals 1820078910000
+ 20223099 × 000000 giving us 0
+ 20223099 × 4000000 producing 80892396000000
+ 20223099 × 60000000 giving us 1213385940000000

= 1296298886490387
