Catalysis of the reaction: 5-diphospho-1D-myo-inositol 1,2,3,4,6-pentakisphosphate + H2O = 1D-myo-inositol 1,2,3,4,5,6-hexakisphosphate + phosphate + H+.
inositol-5-diphosphate-1,2,3,4,6-pentakisphosphate diphosphatase activity