I'm still pressed about this
Most number-one hits —
Bad by Michael Jackson,
Teenage Dream by Katy Perry (5 each)
Most top ten hits —
Thriller by Michael Jackson,
Born In The U.S.A. by Bruce Springsteen,
Janet Jackson's Rhythm Nation 1814 by Janet Jackson (7 each)
NOTE: Numbers listed here are, per Billboard's rules, over
one release.
If multiple releases were to be counted, Teenage Dream would have the most number-ones with 6 and the most top tens with 8.
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Edit: We're all spoiled. A no. 2 peak is amazing!