666817-61-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666817-61-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,8,1 and 7 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 666817-61:
(8*6)+(7*6)+(6*6)+(5*8)+(4*1)+(3*7)+(2*6)+(1*1)=204
204 % 10 = 4
So 666817-61-4 is a valid CAS Registry Number.