Greatest prize money for maths

The Clay Mathematics Institute, a private, non-profit foundation based in Cambridge, Massachusetts, USA, offers prizes of US$1 million (approx. £644,000) each for the solution of seven mathematical problems. The seven Millennium Prize Problems are considered by CMI to be "important classic questions that have resisted solution over the years". The seven problems are: P versus NP; The Hodge conjecture; The Poincaré conjecture (solved, by Russian mathematician Grigori Perelman); The Riemann hypothesis; Yang–Mills existence and mass gap; Navier–Stokes existence and smoothness; The Birch and Swinnerton-Dyer conjecture. The Millennium Grand Challenge in Mathematics