largest_prime_factor:1: syntax error, unexpected end-of-input

number = 600851475143
largest_factor = 0

(0..number).each do |x|
if number % x == 0
if x == 2 || (x % 2 != 0)
prime_factor = x
if prime_factor > largest_factor
largest_factor = prime_factor
end
end
end
end