1. Numbers
  2. Compare 661 vs 664

Compare 661 vs 664

Property661664
Typeprimecomposite number
Unique factors12
Total factors14
Prime factorization661123 × 831
Prime factorization6612 × 2 × 2 × 83
Divisors count28
Divisors1, 6611, 2, 4, 8, 83, 166, 332, 664
Number of properties50
Additive primes65th 
Centered decagonal primes8th 
Primes121st 
Pythagorean primes57th 
Twin primes (2nd member)30th 
Roman numberalsDCLXIDCLXIV
Base 21010010101210100110002
Base 322011132201213
Base 4221114221204
Base 5101215101245
Base 63021630246
Base 71633716367
Base 81225812308
Base 981498179
Base 106611066410
Base 115511155411
Base 124711247412
Base 133bb133c113
Base 143531435614
Base 152e1152e415
Base 162951629816
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