Options to insert a BigInteger in a file

Good days,
As the title says, this more than a doubt is a search of alternatives.
I have a program that performs calculations whose result is a number of several dozens of thousands of digits saved in a variable of type BigInteger. At the moment of returning the result, I use a file to save it.
The problem appears at the moment of handling the number to be able to insert it in the file, because it takes a lot of time. In the last execution that I have done, it took 8 minutes to compute, 19 minutes to transform the BigInteger to a String and barely a second to insert it into the file.
The question is whether anyone knows any more efficient way to perform this step, perhaps with an alternative class to BufferedWriter that I have used to insert in the file and in which we need a char or String as a parameter.
Is important that the file could be read directly by a human.
Regards and thanks.

I don't know how NIO API can help me.
The only quick way I've found to insert the BigInteger in a file is using an ObjectOutputStream, but this creates a file unreadable to me and when I use the method toString() to insert as a String having it readable, it takes too time.
Before opening this item, I've been looking all the types of buffers and OutpuStreams that I found on the API, several of them mentioned in the NIO API, and I've tested to see if some served me. At the end I haven't found any which allow me to avoid the method toString().
Edited by: JaimeLG on Sep 8, 2008 12:35 PM

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