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What is a Build Number ?
A build Number is a _Unique identifier used for the delivery (through batches) of android updates and also an specific identity of a phone .

How to Identify the Numbers in a Build Number ( Nougat and Oreo ).
There are usually 4 sections.
The first part represent the Phone Model -
X572 is synonymous with Note 4
X571 - Note 4 pro etc

The second part represent what I will call the Batch -
This varies with phones .
Mine is H5213AD - the beginning 5 characters are the same for all phones of the same model , now what differentiates them is the letter immediately after the 5 characters . This letters ( sometimes it may be 1) represents the batches that is why some people can receive updates today while some will receive updates next tomorrow .

The third part represents the android version
Mine is - O for Oreo
N - Nougat etc

There is another part that signifies the country especially for India ( IN )

The final part is the date and the version
The format is YYMMDD - Mine is 180810 while the version is usually starts with a V - version and the version number . . .

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