The Counting Thread

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656 = 24 × 41

656 is the number of times Jerusalem is mentioned in the Tanakh, Hebrew Bible, or "Old Testament."

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657 = 32 × 73

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658 = 2 × 7 × 47, sphenic number

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659 prime number, Sophie Germain prime, sum of seven consecutive primes (79 + 83 + 89 + 97 + 101 + 103 + 107), Chen prime, Mertens function sets new low of -10 which stands until 661, highly cototient number, Eisenstein prime with no imaginary part, strictly non-palindromic number

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660 = 22 × 3 × 5 × 11, sum of four consecutive primes (157 + 163 + 167 + 173), sum of six consecutive primes (101 + 103 + 107 + 109 + 113 + 127), sum of eight consecutive primes (67 + 71 + 73 + 79 + 83 + 89 + 97 + 101), sparsely totient number, Harshad number

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661 prime number, sum of three consecutive primes (211 + 223 + 227), Mertens function sets new low of -11 which stands until 665, star number

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662 = 2 × 331, nontotient, member of Mian-Chowla sequence

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663 = 3 × 13 × 17, sphenic number, Smith number

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664 = 23 × 83

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665 = 5 × 7 × 19, sphenic number, Mertens function sets new low of -12 which stands until 1105