666820-57-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666820-57-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,8,2 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 666820-57:
(8*6)+(7*6)+(6*6)+(5*8)+(4*2)+(3*0)+(2*5)+(1*7)=191
191 % 10 = 1
So 666820-57-1 is a valid CAS Registry Number.