Alright, let's work through 65400205 times 63971948 step by step
65400205 × 63971948 = 63971948 × (65400205)
+ 63971948 × 5 giving us 319859740
+ 63971948 × 00 resulting in 0
+ 63971948 × 200 that is equal 12794389600
+ 63971948 × 0000 giving us 0
+ 63971948 × 00000 that equals 0
+ 63971948 × 400000 resulting in 25588779200000
+ 63971948 × 5000000 giving us 319859740000000
+ 63971948 × 60000000 what gives us 3838316880000000

= 4183778513449340
