# What is *binary prefix*?

**Binary Prefix**is what precedes a unit of digital quantity (bit or byte) to indicate multiplication by a power of two. It is intended to slightly differentiate the values of the prefixes from their respective SI/metric prefixes. For example, kibi (2¹⁰ = 1024 ) and kilo (10³ = 1000).

## Input

**Tebi**is a binary unit prefix in the digital quantity denoting multiplication by 2⁴⁰.

## Output

**Pebi**is a binary unit prefix in the digital quantity denoting multiplication by 2⁵⁰.