| Atomic Mass | Mass Excess |
| 166.932045714299 amu | -63.299 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 7/2+ | STABLE | 0 | ||
| .2078 | 1/2- | 2.269 S 0.006 | IT | 100 | .208 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| IT | 2.269 S 0.006 | 207.80 | 41.7+- 0.7 |