661,158

2 × 3² × 23 × 1597

661,158 factors as 2 × 3^2 × 23 × 1597. Its 24 positive divisors give a proper-divisor sum of 834,570, so this integer is abundant. The Collatz stopping time is 216 steps.

Prime Factor Structure

Factorization String 2 × 3^2 × 23 × 1597

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 24

Divisor Sum (σ) 1,495,728

Proper Divisor Sum 834,570

Digit Sum / Digital Root 27 (Root: 9)

Adjacent Primes #661139 ← → #661183

Radix Representation

Decimal	661158
Binary	10100001011010100110 (20 bits)
Octal	0o2413246
Hexadecimal	0xA16A6

Divisor Catalog (24)

Collatz Trajectory (216 steps to reach 1)

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

661,158 330,579 991,738 495,869 1,487,608 743,804 371,902 185,951 557,854 278,927 836,782 418,391 1,255,174 627,587 1,882,762 941,381 2,824,144 1,412,072 706,036 353,018 176,509 529,528 264,764 132,382 66,191 198,574 99,287 297,862 148,931 446,794 223,397 670,192 335,096 167,548 83,774 41,887 125,662 62,831 188,494 94,247 282,742 141,371 424,114 212,057 636,172 318,086 159,043 477,130 238,565 715,696 357,848 178,924 89,462 44,731 134,194 67,097 201,292 100,646 50,323 150,970

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