the longest scientific-notation number (significand.mantissa * 10exponent) that google calculator does NOT choke on is 1.797693134862316965999999… * 10308, where the number of nines after the 16965 string is ~2000 strong. IE crapped out long before i could reach that number. firefox started crapping out at ~1973 nines in, but managed to spit out up to ~1997 before really putting an end to these shenanigans, you know, lest someone lose some eyesight.

in other words, the smallest scientific-notation number that google calculator chokes on is 1.7976931348623169660000… * 10308.

which is ~143.01605…143.01605…

that is all. please drive through.