1666-15-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1666-15-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,6 and 6 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1666-15:
(6*1)+(5*6)+(4*6)+(3*6)+(2*1)+(1*5)=85
85 % 10 = 5
So 1666-15-5 is a valid CAS Registry Number.