Question on the function - hex

[Parag Kalra]

Why does the output of
perl -e "print hex '0x00001600000402'"

differs from the output of
perl -e "print hex 0x00001600000402"

EG:
bash-3.2$ perl -e "print hex '0x00001600000402'"
94489281538

$ perl -e "print hex 0x00001600000402"
10189963531576