663-66-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 663-66-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,6 and 3 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 663-66:
(5*6)+(4*6)+(3*3)+(2*6)+(1*6)=81
81 % 10 = 1
So 663-66-1 is a valid CAS Registry Number.