It doesn't seem like it could answer 115792089237316195423570985008687907853269984665640564039457584007913129639936 * 115792089237316195423570985008687907853269984665640564039457584007913129639936. Can anyone less check if it works for you?
=13407 8079299425 9709957402 4998205846 1274793658 2059239337 7723561443 7217640300 7354697680 1874298166 9034276900 3185818648 6050853753 8828119465 6994643364 9006084096.
This is what I got when I put this into the calculator: 13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096.