501
Hilary, spelled הילרי has the numeric value of 255
There aren't 3 letters that mean antichrist, mainly because there is no Hebrew word for antichrist. In fact, the 3 root letters in Obama's name in Hebrew means "blessed".
checksum
×“×™× ×” = 69
Derek
Barack
Barack
Hussein
Hussein
Sasha & Malia
dog
No. It is the numeric equivalent to the Gematria or numeric value of his name. Also, according to the ancient writers, he stabbed himself in the throat with the help of his secretary, on June 9, 68 AD.