No problem, we've got 80640335 and 17371745 to multiply
80640335 × 17371745 = 17371745 × (80640335)
+ 17371745 × 5 producing 86858725
+ 17371745 × 30 that equals 521152350
+ 17371745 × 300 what gives us 5211523500
+ 17371745 × 0000 resulting in 0
+ 17371745 × 40000 giving us 694869800000
+ 17371745 × 600000 producing 10423047000000
+ 17371745 × 0000000 yielding 0
+ 17371745 × 80000000 giving us 1389739600000000

= 1400863336334575
