// prints 8
Debug.Log(Mathf.NextPowerOfTwo(7));

// prints 256
Debug.Log(Mathf.NextPowerOfTwo(139));

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        Debug.Log(Mathf.NextPowerOfTwo(7));
        Debug.Log(Mathf.NextPowerOfTwo(139));
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        Debug.Log(Mathf.NextPowerOfTwo(7))
        Debug.Log(Mathf.NextPowerOfTwo(139))