How can I work with binary numbers?

Finally, I found a answer. We can deal with binary numbers as if they were string, with these functions:

func _ready():
	
	var b = "1111011"
	var i = bin2dec(b)
	print(i) # 123

# Takes in a decimal value (int) and returns the binary value (int)
func dec2bin(var decimal_value):
	var binary_string = "" 
	var temp 
	var count = 31 # Checking up to 32 bits 
	
	while(count >= 0):
		temp = decimal_value >> count 
		if(temp & 1):
			binary_string = binary_string + "1"
		else:
			binary_string = binary_string + "0"
		count -= 1
	
	return int(binary_string)

# Takes in a binary value (int) and returns the decimal value (int)
func bin2dec(var binary_value):
	var decimal_value = 0
	var count = 0
	var temp
	
	while(binary_value != 0):
		temp = binary_value % 10
		binary_value /= 10
		decimal_value += temp * pow(2, count)
		count += 1
	
	return decimal_value

This code was made by IVAN SKODJE, he explain it in his blog: ivanskodje.com/2016/10/11/55/

@GerHarm I will explain it: phisicsobjects such as kinematicBody, rigidBody and staticBody have a property called collision_layer and collision_mask, and their values are binary.

What I wanted to do was change the value of these variables in order, something like decimal numbers: 1, then 2, 3, 4, 5. But since they are binary, in decimal their value would be 1, 2, 4, 8, 16 etc.

However when I read your question, I remember the binary operators. I have completely forgotten them! but rather as I saw that gdscript had not incorporated binary numbers, maybe I assumed that binary operator did not exist. :/

The point is that I found a way (thanks to you) to do what I wanted to do, assign the value of these variables as if they were decimals:

extends KinematicBody2D

func _ready():
	set_layer(4)
	print(self.collision_layer) # print 8
	set_layer(5)
	print(self.collision_layer) # print 16

func set_layer(n):
	self.collision_layer = 1 << (n-1)

Thank you! :)