If you actually look at this, it's really not all that impressive - just a big load of marketing bullshit. Lets analyze:
Unique Security Characters (not counting minor tint variations or body types): 4,530,240
Unique Security Characters (not counting minor tint variations but including body types):13,590,720
Unique Security Characters (including minor tint variations, but not body types)15,775,119,360,000,000
Unique Security Characters (including minor tint variations and body types) 47,325,358,080,000,000
The unique characters (with body types) divided by unique characters (without body types) should give us the number of body types available:
3.
Similarly, tint variations divided by the version without should give us an idea of how many color combinations there are (about 3.5 billion). To put this in scale, giving the player the option to select the color of four badges, buttons, pieces of clothing, or trimmings with a 256-color palette (an utterly anemic palette, by the way, by modern standards) gives about 4.2 billion possible combinations. Or, put another way: if the player gets to choose the color of their helmet and their rank insignia, they'll have access to around 60,000 possible colors.
Similarly, I am unimpressed by the 'Unique Characters' count. Consider the basics - eye color, hair color, hair type, facial type, facial hair, even just using static pre-generated settings it would be possible to technically come up with a million or so 'unique' heads very easily, and this is all before factoring in things like minor changes to costume (pouches, or no pouches? shoulder strap, or no shoulder strap?). With four eye colors, four hair colors, ten hair styles, and ten types of facial hair, you get 16,000 possibilities. Put a slider on any one of these that lets you choose how long hair is and you can expand that one option alone to upwards of 30 different 'unique' appearances.
Bragging about how many unique character models there were in a game stopped being worth mentioning around the Playstation 2, and I'm more than willing to bet that - for all practical purposes - at least 70% of the game will revolve around people wearing one color shooting at people wearing a different color, because in the middle of a heated firefight, that's all you have time to distinguish before you either have to open fire or take cover.