18798356545920 has 1536 divisors, whose sum is σ = 78037590758400. Its totient is φ = 4080862494720.

The previous prime is 18798356545889. The next prime is 18798356546003. The reversal of 18798356545920 is 2954565389781.

18798356545920 is a `hidden beast` number, since 1 + 8 + 7 + 9 + 8 + 3 + 56 + 545 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

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 191 ways as a sum of consecutive naturals, for example, 9857553607 + ... + 9857555513.

It is an arithmetic number, because the mean of its divisors is an integer number (50805723150).

It is a 1-persistent number, because it is pandigital, but 2⋅18798356545920 = 37596713091840 is not.

Almost surely, 2^{18798356545920} is an apocalyptic number.

18798356545920 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 18798356545920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39018795379200).

18798356545920 is an abundant number, since it is smaller than the sum of its proper divisors (59239234212480).

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

18798356545920 is a wasteful number, since it uses less digits than its factorization.

18798356545920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 653184000, while the sum is 72.

The spelling of 18798356545920 in words is "eighteen trillion, seven hundred ninety-eight billion, three hundred fifty-six million, five hundred forty-five thousand, nine hundred twenty".