Alright, let's work through 99664978 times 69810061 step by step
99664978 × 69810061 = 69810061 × (99664978)
+ 69810061 × 8 producing 558480488
+ 69810061 × 70 producing 4886704270
+ 69810061 × 900 yielding 62829054900
+ 69810061 × 4000 giving us 279240244000
+ 69810061 × 60000 that is equal 4188603660000
+ 69810061 × 600000 that is equal 41886036600000
+ 69810061 × 9000000 resulting in 628290549000000
+ 69810061 × 90000000 resulting in 6282905490000000

= 6957618193743658
