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BaseRepresentation
bin11000010001111011011…
…101101011000010000010
312220111201221021102012212
4120101323131223002002
5204314111240434400
63314301254022122
7231355306555331
oct30217335530202
95814657242185
101668518686850
11593684334014
1222b453647942
13c14574c1c22
145aa846a5d18
152d606b3c335
hex1847b76b082

1668518686850 has 24 divisors (see below), whose sum is σ = 3286000333188. Its totient is φ = 628148211200.

The previous prime is 1668518686843. The next prime is 1668518686903. The reversal of 1668518686850 is 586868158661.

It can be written as a sum of positive squares in 6 ways, for example, as 588646476289 + 1079872210561 = 767233^2 + 1039169^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 981480731 + ... + 981482430.

Almost surely, 21668518686850 is an apocalyptic number.

1668518686850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668518686850 is a deficient number, since it is larger than the sum of its proper divisors (1617481646338).

1668518686850 is a wasteful number, since it uses less digits than its factorization.

1668518686850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962963190 (or 1962963185 counting only the distinct ones).

The product of its (nonzero) digits is 132710400, while the sum is 68.

The spelling of 1668518686850 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred eighty-six thousand, eight hundred fifty".