| Atomic Mass | Mass Excess |
| 166.932848725495 amu | -62.551 MeV |
| Level energy (MeV) | Spin & parity | Half-life | Mode of decay | Branch ratio (%) | Decay energy (MeV) |
| Ground state | 1/2+ | 9.25 D 0.02 | EC | 100 | 0 |
| Decay mode | Half-life | Gamma-ray energy (keV) | Intensity (%) |
| EC | 9.25 D 0.02 | 57.10 | 4.6+- 1.0 |
| EC | 9.25 D 0.02 | 207.80 | 41.+- 8. |
| EC | 9.25 D 0.02 | 531.5 | 1.59+- 0.21 |