The death toll from Hurricane Ian in Florida has risen to 66, CNN reported Sunday, as the southern state took stock of the aftermath of one of the most powerful storms ever to hit the United States.

On Saturday, the death toll from Hurricane Ian in Florida stood at 44.

The National Hurricane Center (NHC) said Ian made landfall near Georgetown, South Carolina, as a Category 1 hurricane with maximum sustained winds of 85 miles (140 kilometers) per hour.

It was later downgraded to a post-tropical cyclone but the NHC said Friday evening that Ian is bringing heavy rain, flash flooding and high winds to both South Carolina and North Carolina. Some areas can expect up to eight inches of rain.

As for storm-ravaged Florida, President Joe Biden said: "We're just beginning to see the scale of the destruction.

"It's likely to rank among the worst in the nation's history," he said of Ian, which barreled into Florida's southwest coast on Wednesday as a Category 4 storm, a tick shy of the most powerful on the Saffir-Simpson wind scale.

Seventeen migrants also remain missing from a boat that sank during the hurricane on Wednesday, according to the Coast Guard. One person was found dead and nine others rescued, including four Cubans who swam to shore in the Florida Keys.

With damage estimates running into the tens of billions of dollars, Biden said it's "going to take months, years to rebuild."

"It's not just a crisis for Florida," he said. "This is an American crisis."

CoreLogic, a firm that specializes in property analysis, said wind-related losses for residential and commercial properties in Florida could cost insurers up to $32 billion while flooding losses could go as high as $15 billion.

"This is the costliest Florida storm since Hurricane Andrew made landfall in 1992," CoreLogic's Tom Larsen said.