The Venus mantra, or Shukra mantra, can be chanted 108 times, 324 times, or 2,268 times. there should be chanting of 4 times so you should chant the same for 64000 times.
ॐ द्रां द्रीं द्रौं सः शुक्राय नमः ॥“Om Draam Dreem Draum Sah: Shukray Namah:"