the golden ratio = 

1.61803398875

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More info

Golden ratio - Wikipedia

https://en.wikipedia.org/wiki/Golden_ratio

In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. The figure on the right ...

Decimal‎: ‎1.6180339887498948482...

Hexadecimal‎: ‎1.9E3779B97F4A7C15F39

Binary‎: ‎1.1001111000110111011

Golden Ratio - Math is Fun

https://www.mathsisfun.com/numbers/golden-ratio.html

Golden Ratio. The golden ratio (symbol is the Greek letter "phi" shown at left) is a special number approximately equal to 1.618.