19855198080 has 192 divisors, whose sum is σ = 69587154000. Its totient is φ = 5215592448.

The previous prime is 19855198049. The next prime is 19855198133. The reversal of 19855198080 is 8089155891.

19855198080 is a `hidden beast` number, since 1 + 9 + 8 + 551 + 9 + 8 + 0 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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 23 ways as a sum of consecutive naturals, for example, 360196 + ... + 411644.

Almost surely, 2^19855198080 is an apocalyptic number.

19855198080 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 19855198080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34793577000).

19855198080 is an abundant number, since it is smaller than the sum of its proper divisors (49731955920).

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

19855198080 is a wasteful number, since it uses less digits than its factorization.

19855198080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51541 (or 51526 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 54.

The spelling of 19855198080 in words is "nineteen billion, eight hundred fifty-five million, one hundred ninety-eight thousand, eighty".