1. Numbers
  2. Compare 661 vs 669

Compare 661 vs 669

Property661669
Typeprimesemiprime
Unique factors12
Total factors12
Prime factorization661131 × 2231
Prime factorization6613 × 223
Divisors count24
Divisors1, 6611, 3, 223, 669
Number of properties51
Additive primes65th 
Centered decagonal primes8th 
Primes121st 
Pythagorean primes57th 
Semiprimes 200th
Twin primes (2nd member)30th 
Roman numberalsDCLXIDCLXIX
Base 21010010101210100111012
Base 322011132202103
Base 4221114221314
Base 5101215101345
Base 63021630336
Base 71633716447
Base 81225812358
Base 981498239
Base 106611066910
Base 115511155911
Base 124711247912
Base 133bb133c613
Base 143531435b14
Base 152e1152e915
Base 162951629d16
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