Alright, let's work through 64260864 times 66532377 step by step
64260864 × 66532377 = 66532377 × (64260864)
+ 66532377 × 4 yielding 266129508
+ 66532377 × 60 what gives us 3991942620
+ 66532377 × 800 that equals 53225901600
+ 66532377 × 0000 giving us 0
+ 66532377 × 60000 that equals 3991942620000
+ 66532377 × 200000 that is equal 13306475400000
+ 66532377 × 4000000 producing 266129508000000
+ 66532377 × 60000000 yielding 3991942620000000

= 4275428029993728
