66557-16-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 66557-16-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,5 and 7 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 66557-16:
(7*6)+(6*6)+(5*5)+(4*5)+(3*7)+(2*1)+(1*6)=152
152 % 10 = 2
So 66557-16-2 is a valid CAS Registry Number.