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18138543192 = 233471119353
BaseRepresentation
bin10000111001001001…
…000011010001011000
31201211002212110120000
4100321021003101120
5244121431340232
612155511533000
71211330034060
oct207111032130
951732773500
1018138543192
117768809a70
12362268a160
131930b4a7c3
14c40db23a0
1571262327c
hex439243458

18138543192 has 640 divisors, whose sum is σ = 68120870400. Its totient is φ = 4379132160.

The previous prime is 18138543191. The next prime is 18138543209. The reversal of 18138543192 is 29134583181.

18138543192 is a `hidden beast` number, since 1 + 8 + 13 + 8 + 543 + 1 + 92 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138543191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 342236638 + ... + 342236690.

It is an arithmetic number, because the mean of its divisors is an integer number (106438860).

Almost surely, 218138543192 is an apocalyptic number.

18138543192 is a gapful number since it is divisible by the number (12) 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 18138543192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34060435200).

18138543192 is an abundant number, since it is smaller than the sum of its proper divisors (49982327208).

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

18138543192 is a wasteful number, since it uses less digits than its factorization.

18138543192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 95 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 18138543192 in words is "eighteen billion, one hundred thirty-eight million, five hundred forty-three thousand, one hundred ninety-two".