Amazon Had Their Best Holiday Season, Shipped Over 1 Billion Items

Amazon says they had the best holiday season ever -- shipping more than one billion items around the world.

Forbes reports Amazon sold enough Alexa devices and 4K TVs to reach the peak of Mount Everest more than nine times.

The online retailer said it recruited more shoppers to sign up for its Prime Membership program than it did any other holiday season, helping with its record breaking sales.

According to Cowen and Company, as of November more than 50 million U.S. households subscribed to Prime.

Amazon reports more than 72 percent of Amazon's customers used their mobile devices to shop.