“The fans’ support is huge too. People thank me for my music all the time," he added, citing "garbage truck drivers" as being among those who their gratitude.
"Even the other day a guy popped out of a manhole to say hi.”
As well as his residency, Manilow has been working on a musical about a Second World War German-Jewish comedy group.
The show, titled Harmony, is expected to launch on Broadway in New York at the Barrymore Theatre in October.
Proceeds from his record-breaking weekend in Vegas will go to several charities including the Barbara Sinatra Children’s Center and the Manilow Music Project.
Earlier this month he said: “It’s an honour to be on the same stage that The King once graced.
“The weekend is going to be especially meaningful because we are also going to raise money for some very deserving charities.”