Maximum number of elements that Altair can handle

Altair? or Altair's software? Which software?

It's Hypermesh! 

I don't think there's a hard limit somewhere. It's rather the limit of your hardware (CPU, GPU, MEM,...)

It's Hypermesh! 

Upto 2^32 as I see.

But almost solvers handle upto I8 (99,999,999)

So if you use hm with IDs higher than I8, you cannot export them.

But in case of solid 3D topology optimization would it be the same?  

I already answer your question.

Can you think logically.

 

Upto 2^32 as I see.

But almost solvers handle upto I8 (99,999,999)

So if you use hm with IDs higher than I8, you cannot export them.

 

Have a look at: https://en.wikipedia.org/wiki/Integer_(computer_science)

With type Integer 8 under 64-bit system, you can have up to 2^64 - 1 

Where comes from your value '99,999,999'?

Oh, sorry. I mean 8-digit integer instead of 8-byte int