Catalyzes the hydrolysis of the free cytosolic methylated adenosine nucleotide N(6)-methyl-AMP (N6-mAMP) to produce inositol monophosphate (IMP) and methylamine. Is required for the catabolism of cytosolic N6-mAMP, which is derived from the degradation of mRNA containing N6-methylated adenine (m6A). H(+) + H2O + N(6)-methyl-AMP = IMP + methylamine Binds 1 zinc ion per subunit. Monomer. Belongs to the metallo-dependent hydrolases superfamily. Adenosine and AMP deaminases family. Extended N-terminus.