Compare 666640 vs 666647

Property	666640	666647
Type	composite number	prime
Unique factors	4	1
Total factors	7	1
Prime factorization	2⁴ × 5¹ × 13¹ × 641¹	666647¹
Prime factorization	2 × 2 × 2 × 2 × 5 × 13 × 641	666647
Divisors count	40	2
Divisors	1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 641, 1040, 1282, 2564, 3205, 5128, 6410, 8333, 10256, 12820, 16666, 25640, 33332, 41665, 51280, 66664, 83330, 133328, 166660, 333320, 666640	1, 666647
Number of properties	0	6
Chen primes		21139th
Cousin primes (2nd member)		5830th
Primes		54068th
Prime triplets (2nd member)		2130th
Safe primes		3122nd
Twin primes (1st member)		5837th
Roman numberals
Base 2	10100010110000010000₂	10100010110000010111₂
Base 3	1020212110101₃	1020212110122₃
Base 4	2202300100₄	2202300113₄
Base 5	132313030₅	132313042₅
Base 6	22142144₆	22142155₆
Base 7	5444362₇	5444402₇
Base 8	2426020₈	2426027₈
Base 9	1225411₉	1225418₉
Base 10	666640₁₀	666647₁₀
Base 11	415947₁₁	415953₁₁
Base 12	281954₁₂	28195b₁₂
Base 13	1a4580₁₃	1a4587₁₃
Base 14	134d32₁₄	134d39₁₄
Base 15	d27ca₁₅	d27d2₁₅
Base 16	a2c10₁₆	a2c17₁₆