Has a FIBA World Cup game ever ended 65-39?
Exactly once. On November 27, 2017, Iran beat Qatar 65-39, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 65-39 in league history.
That makes 65-39 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 66-39 has happened never and 65-40 has happened never.