18722426129820 has 360 divisors, whose sum is σ = 66276778211280. Its totient is φ = 4277852974080.

The previous prime is 18722426129753. The next prime is 18722426129821. The reversal of 18722426129820 is 2892162422781.

18722426129820 is a `hidden beast` number, since 1 + 8 + 72 + 2 + 4 + 261 + 298 + 20 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722426129821) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1529478900 + ... + 1529491140.

It is an arithmetic number, because the mean of its divisors is an integer number (184102161698).

Almost surely, 2^{18722426129820} is an apocalyptic number.

18722426129820 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 18722426129820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33138389105640).

18722426129820 is an abundant number, since it is smaller than the sum of its proper divisors (47554352081460).

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

18722426129820 is a wasteful number, since it uses less digits than its factorization.

18722426129820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15823 (or 15797 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 18722426129820 in words is "eighteen trillion, seven hundred twenty-two billion, four hundred twenty-six million, one hundred twenty-nine thousand, eight hundred twenty".