It was an especially good week for Tim Cook.

According to Time Money, the Apple CEO’s net worth increased by $34 million during the past few days, thanks in large part to the in-store launch of the iPhone X. Cook’s total estimated net worth was at $666,497,782 as of Friday.

Dan Marcec, director of content at Equilar, calculated that figure based on Cook’s stakes in Apple as well as Nike, where he serves on the lead independent director. It’s also important to note that the estimate does not take in account any of his additional assets (like property), meaning the CEO’s net worth is probably higher. Much higher.

Apple’s stock broke a record Monday when it reached $168.07 as excitement built around the highly coveted smartphone. On Friday, Apple surpassed that figure with an all-time high of $174.10 per share, briefly becoming the first $900 billion U.S. company. Its stock closed at $172.50 on Friday.

The company doesn’t expect to lose any momentum. During a conference call with analysts this week, Cook said company revenue jumped by 12 percent in China during the fourth quarter. He also noted the surge in iPhone, iPad, Apple Watch, Mac, and Services sales.

"The China rebound was broad based across the products," Cook explained on the call. "I mean we literally were firing on all cylinders. That and our new products give us great confidence headed into this holiday season that this is going to be the best holiday season yet."