ulong

using System;//from   j  a v  a2 s .c o  m

public class MainClass{
    public static void Main() {
        unsigned long ulVal = 0776745ul;  // Unsigned long value
        Console.WriteLine(ulVal);

    }
}

using System;//ja  v  a  2 s . co m

class MainClass
{
    static void Main(string[] args)
    {
        ulong loopCount = 0;
        ulong factorial = 1;
        loopCount = 23;
        for( ulong i = loopCount; i > 0; i-- )
        {
            factorial *= i;
        }
        Console.WriteLine( "{0}! = {1}", loopCount, factorial );

    }
}

using System;//from j a  v a 2s.  c  o m

public class Example
{
   public static void Main()
   {
      ulong value = 163249057;
      // Display value using default ToString method.
      Console.WriteLine(value.ToString());      
      Console.WriteLine();

      // Define an array of format specifiers.
      string[] formats = { "G", "C", "D", "F", "N", "X" };
      // Display value using the standard format specifiers.
      foreach (string format in formats)
         Console.WriteLine("{0} format specifier: {1,16}",format, value.ToString(format));         
   }
}