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BaseRepresentation
bin10000011101000000…
…111111011110101010
31200121012221202010000
4100131000333132222
5242140131342313
612041014003430
71163540130015
oct203500773652
950535852100
1017666668458
11754641254a
123510646576
13188716229a
14bd845c37c
156d5eb3673
hex41d03f7aa

17666668458 has 20 divisors (see below), whose sum is σ = 39586424130. Its totient is φ = 5888889432.

The previous prime is 17666668421. The next prime is 17666668463. The reversal of 17666668458 is 85486666671.

It can be written as a sum of positive squares in only one way, i.e., 12348321129 + 5318347329 = 111123^2 + 72927^2 .

It is a super-3 number, since 3×176666684583 (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 17666668395 and 17666668404.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 54526593 + ... + 54526916.

Almost surely, 217666668458 is an apocalyptic number.

17666668458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

17666668458 is an abundant number, since it is smaller than the sum of its proper divisors (21919755672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17666668458 is a wasteful number, since it uses less digits than its factorization.

17666668458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109053523 (or 109053514 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 17666668458 in words is "seventeen billion, six hundred sixty-six million, six hundred sixty-eight thousand, four hundred fifty-eight".