The CAS Registry Mumber 663606-01-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,3,6,0 and 6 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 663606-01: (8*6)+(7*6)+(6*3)+(5*6)+(4*0)+(3*6)+(2*0)+(1*1)=157 157 % 10 = 7 So 663606-01-7 is a valid CAS Registry Number.
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