Alright, let's work through 64137447 times 53205471 step by step
64137447 × 53205471 = 53205471 × (64137447)
+ 53205471 × 7 that is equal 372438297
+ 53205471 × 40 that results in 2128218840
+ 53205471 × 400 what gives us 21282188400
+ 53205471 × 7000 producing 372438297000
+ 53205471 × 30000 producing 1596164130000
+ 53205471 × 100000 which equals 5320547100000
+ 53205471 × 4000000 producing 212821884000000
+ 53205471 × 60000000 producing 3192328260000000

= 3412463076372537
