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18685212000 = 2535371371241
BaseRepresentation
bin10001011001101110…
…011011010101100000
31210020012112010011220
4101121232123111200
5301231403241000
612330040535040
71231015452510
oct213156332540
953205463156
1018685212000
117a19351374
123755781480
1319ba192980
14c93835840
157456091a0
hex459b9b560

18685212000 has 768 divisors, whose sum is σ = 76716896256. Its totient is φ = 3870720000.

The previous prime is 18685211981. The next prime is 18685212103. The reversal of 18685212000 is 21258681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 77531880 + ... + 77532120.

It is an arithmetic number, because the mean of its divisors is an integer number (99891792).

Almost surely, 218685212000 is an apocalyptic number.

18685212000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18685212000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38358448128).

18685212000 is an abundant number, since it is smaller than the sum of its proper divisors (58031684256).

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

18685212000 is a wasteful number, since it uses less digits than its factorization.

18685212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 18685212000 in words is "eighteen billion, six hundred eighty-five million, two hundred twelve thousand".