Factor Info
| ID | 1983 |
| Size | 87 digits / 287 bits |
| Status | composite |
| Value | 172976507403292280350780752776302435904094473687619319287550818746541890275050111436721 |
Factorizations
| Primary | (ID: 1984) 4378084769822207978971 (proven prime) |
| (ID: 1985) 39509629552083062393274012475569797657963161709539301744383665251 (composite) |
Primary factorization keeps track of the smallest (known) prime factor. Secondary factorizations are old results kept when a new smaller prime factor is found, which occasionally happens with ECM.