While there have been a number of truly bad popes who were vile and disgusting, none of them would be classified as being heretics. None of the bad popes ever taught anything contrary to the doctrines of the Catholic Church.
There have been 13 popes named Innocent.
Throughout history, there have been a few instances of popes who were married, but the majority of popes have been celibate.
217 popes have been born in Italy.
There have been no popes named Jude.
There have been no popes named Kenneth.
The heretics were those who were unfaithful to religion after the catastrophe in the late middle ages, where 3 popes were elected all at once. The religious people wanted to eliminate these heretics, which was one of the fundamental reasons for the reformation.
As of April 2013 there have been 266 popes.
There have been 117 Popes of the Coptic See of Alexandria (Orthodox)
There have been 217 Italian popes and only 49 non-Italian popes.
There have been 6 popes named Sixtus.
There have been 13 popes named Leo.
There have been 8 popes called Urban.