Alright, let's work through 18258404 times 42642293 step by step
18258404 × 42642293 = 42642293 × (18258404)
+ 42642293 × 4 that equals 170569172
+ 42642293 × 00 giving us 0
+ 42642293 × 400 resulting in 17056917200
+ 42642293 × 8000 that is equal 341138344000
+ 42642293 × 50000 that results in 2132114650000
+ 42642293 × 200000 that equals 8528458600000
+ 42642293 × 8000000 that results in 341138344000000
+ 42642293 × 10000000 yielding 426422930000000

= 778580213080372
