9999999999999 x 99999999999999999999999999999999999999999 = 999999999999899999999999999999999999999990000000000001
[That was actually much quicker to work out than to type in (accurately)!]
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365 x 9999999999999 = 3649999999999635 9999999999999 = 10000000000000 - 1 ⇒ 365 x 9999999999999 = 365 x (10000000000000 - 1) = 3650000000000000 - 365 = 3649999999999635
9,999,999,999,999 is Nine Trillion Nine Hundred and Ninety Nine Billion Nine Hundred and Ninety Nine Million Nine Hundred and Ninety Nine
nine trillion nine hundred ninety nine billion nine hundred ninety nine million nine hundred ninety nine thousand nine hundred ninety nine
the answer is 64,023,737,057,280,000.
8 times 8 times 8 times 8 times 8 times 8, or 86 is 262,144