Alright, let's work through 68136503 times 19837980 step by step
68136503 × 19837980 = 19837980 × (68136503)
+ 19837980 × 3 that results in 59513940
+ 19837980 × 00 which equals 0
+ 19837980 × 500 giving us 9918990000
+ 19837980 × 6000 that is equal 119027880000
+ 19837980 × 30000 which equals 595139400000
+ 19837980 × 100000 that equals 1983798000000
+ 19837980 × 8000000 that equals 158703840000000
+ 19837980 × 60000000 which equals 1190278800000000

= 1351690583783940
