Paul Erdos was a strange man. He lived out of two suitcases, never learned how to cook his own meals, worked up to 19 hours per day, took amphetamines daily and washed them down with caffeine, and gave away nearly all of the money that he earned. 
Erdos was also the most prolific mathematician of the 20th century. He wrote or co-authored over 1,500 mathematical articles during his career and partnered with over 500 different collaborators. As you would expect, his contributions to mathematics were significant.