17999798017680 has 320 divisors, whose sum is σ = 62915973120000. Its totient is φ = 4729446931968.

The previous prime is 17999798017673. The next prime is 17999798017681. The reversal of 17999798017680 is 8671089799971.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 17999798017680.

It is not an unprimeable number, because it can be changed into a prime (17999798017681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44070241 + ... + 44476799.

It is an arithmetic number, because the mean of its divisors is an integer number (196612416000).

Almost surely, 2^{17999798017680} is an apocalyptic number.

17999798017680 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 17999798017680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31457986560000).

17999798017680 is an abundant number, since it is smaller than the sum of its proper divisors (44916175102320).

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

17999798017680 is a wasteful number, since it uses less digits than its factorization.

17999798017680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406883 (or 406871 counting only the distinct ones).

The product of its (nonzero) digits is 864162432, while the sum is 81.

The spelling of 17999798017680 in words is "seventeen trillion, nine hundred ninety-nine billion, seven hundred ninety-eight million, seventeen thousand, six hundred eighty".