66657-70-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 66657-70-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,6,5 and 7 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 66657-70:
(7*6)+(6*6)+(5*6)+(4*5)+(3*7)+(2*7)+(1*0)=163
163 % 10 = 3
So 66657-70-3 is a valid CAS Registry Number.