18991889804160 has 4096 divisors, whose sum is σ = 91053849600000. Its totient is φ = 3750300352512.

The previous prime is 18991889804159. The next prime is 18991889804161. The reversal of 18991889804160 is 6140898819981.

It is an interprime number because it is at equal distance from previous prime (18991889804159) and next prime (18991889804161).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18991889804161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 106099942951 + ... + 106099943129.

It is an arithmetic number, because the mean of its divisors is an integer number (22229943750).

Almost surely, 2^{18991889804160} is an apocalyptic number.

18991889804160 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 18991889804160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45526924800000).

18991889804160 is an abundant number, since it is smaller than the sum of its proper divisors (72061959795840).

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

18991889804160 is an equidigital number, since it uses as much as digits as its factorization.

18991889804160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 72.

The spelling of 18991889804160 in words is "eighteen trillion, nine hundred ninety-one billion, eight hundred eighty-nine million, eight hundred four thousand, one hundred sixty".