6,647,145

3 × 5 × 503 × 881

Starting at 6,647,145, the Collatz iteration reaches 1 after 139 steps. The first transition is 19941436; the starting value is odd with 16 positive divisors.

Prime Factor Structure

Factorization String 3 × 5 × 503 × 881

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 10,668,672

Proper Divisor Sum 4,021,527

Digit Sum / Digital Root 33 (Root: 6)

Adjacent Primes #6647141 ← → #6647167

Radix Representation

Decimal	6647145
Binary	11001010110110101101001 (23 bits)
Octal	0o31266551
Hexadecimal	0x656D69

Divisor Catalog (16)

1 3 5 15 503 881 1,509 2,515 2,643 4,405 7,545 13,215 443,143 1,329,429 2,215,715 6,647,145

Collatz Trajectory (139 steps to reach 1)

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

6,647,145 19,941,436 9,970,718 4,985,359 14,956,078 7,478,039 22,434,118 11,217,059 33,651,178 16,825,589 50,476,768 25,238,384 12,619,192 6,309,596 3,154,798 1,577,399 4,732,198 2,366,099 7,098,298 3,549,149 10,647,448 5,323,724 2,661,862 1,330,931 3,992,794 1,996,397 5,989,192 2,994,596 1,497,298 748,649 2,245,948 1,122,974 561,487 1,684,462 842,231 2,526,694 1,263,347 3,790,042 1,895,021 5,685,064 2,842,532 1,421,266 710,633 2,131,900 1,065,950 532,975 1,598,926 799,463 2,398,390 1,199,195 3,597,586 1,798,793 5,396,380 2,698,190 1,349,095 4,047,286 2,023,643 6,070,930 3,035,465 9,106,396

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