The sales keep climbing for Adele's blockbuster 25 album.

After processing the first sales reports through Nov. 29, Nielsen Music says that 25 has sold at least 650,000 copies in its second week on sale in the U.S. Combined with the 3.38 million 25 sold in its first week (Nov. 20-Nov. 26), the album has now sold more than 4 million in pure album sales. The album’s second tracking week began on Nov. 27 (the always-busy shopping day known as Black Friday).

25 is the first album to sell more than 4 million copies in a calendar year since Adele's own 21 moved 4.41 million in 2012. (In fact, the only albums to sell at least 4 million in a calendar year since 2006 have been titles by Adele. Aside from 25 in 2015 and 21 in 2012, she also did it with 21 in 2011: 5.82 million.)

There are slightly more than four days left in the sales tracking week to be tabulated (as it ends at the close of business on Thursday, Dec. 3) . Some industry forecasters suggest the album could sell another million copies in its second week, making it the first album to sell a million copies in more than one week.

Billboard is scheduled to report 25's second-week sales on Sunday, Dec. 6, once Nielsen has finished processing its weekly data.

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