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19800000861 = 317388235311
BaseRepresentation
bin10010011100001011…
…000000100101011101
31220002220012021000020
4102130023000211131
5311022300011421
613032422422353
71300443142014
oct223413004535
956086167006
1019800000861
118440647783
123a06b919b9
131b37120b54
14d5b903a7b
157ad411dc6
hex49c2c095d

19800000861 has 8 divisors (see below), whose sum is σ = 27952942464. Its totient is φ = 12423529920.

The previous prime is 19800000853. The next prime is 19800000863. The reversal of 19800000861 is 16800000891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19800000861 - 23 = 19800000853 is a prime.

19800000861 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800000863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194117605 + ... + 194117706.

It is an arithmetic number, because the mean of its divisors is an integer number (3494117808).

Almost surely, 219800000861 is an apocalyptic number.

It is an amenable number.

19800000861 is a deficient number, since it is larger than the sum of its proper divisors (8152941603).

19800000861 is a wasteful number, since it uses less digits than its factorization.

19800000861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388235331.

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 19800000861 in words is "nineteen billion, eight hundred million, eight hundred sixty-one", and thus it is an aban number.

Divisors: 1 3 17 51 388235311 1164705933 6600000287 19800000861