Perdeuterofullerane, C60D36 was synthesized in toluene solution from DCl and Zn. The FT-IR spectrum of C60D36 was compared with that of C60H36, and the C-H stretching and bending shift due to deuteration was measured so that H/ D = 1.36. The thermal stability of C60D36 was studied under N2 by thermogravimetric and differential thermal analysis. It has been found that the substitution of hydrogen with deuterium in fullerene leads to a significant increase in thermal stability which was attributed to isotope effect. In particular, the onset of decomposition of C60H36 occurred at 412 degrees C in comparison to 465 degrees C measured on C60D36. The maximum decomposition rate of C60H36 was found at 501 degrees C and was shifted to 549 degrees C in C60D36. Perdeuterofullerane was found much more stable also to air oxidation. It oxidized slowly when exposed to air and some days were needed to reach a degree of oxidation, which was reached in 1 hour by C60H36.