How would 5.58e 23 be spoken?

The best way is five point fifty eight times ten to the power of 23.

But, if you want to make life difficult for your audience, you could try five hundred fifty eight sextillion. Mathematicians (and scientists) in the audience will prefer the scientific notation (as spoken above) and most non-mathematically able members of the audience will have no idea what a sextillion is anyway.

So you need to decide: do you wish to communicate or obfuscate!

The best way is five point fifty eight times ten to the power of 23.

But, if you want to make life difficult for your audience, you could try five hundred fifty eight sextillion. Mathematicians (and scientists) in the audience will prefer the scientific notation (as spoken above) and most non-mathematically able members of the audience will have no idea what a sextillion is anyway.

So you need to decide: do you wish to communicate or obfuscate!

The best way is five point fifty eight times ten to the power of 23.

But, if you want to make life difficult for your audience, you could try five hundred fifty eight sextillion. Mathematicians (and scientists) in the audience will prefer the scientific notation (as spoken above) and most non-mathematically able members of the audience will have no idea what a sextillion is anyway.

So you need to decide: do you wish to communicate or obfuscate!

The best way is five point fifty eight times ten to the power of 23.

But, if you want to make life difficult for your audience, you could try five hundred fifty eight sextillion. Mathematicians (and scientists) in the audience will prefer the scientific notation (as spoken above) and most non-mathematically able members of the audience will have no idea what a sextillion is anyway.

So you need to decide: do you wish to communicate or obfuscate!