17993991680 has 240 divisors, whose sum is σ = 50960082096. Its totient is φ = 6074449920.

The previous prime is 17993991679. The next prime is 17993991761. The reversal of 17993991680 is 8619939971.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8403410 + ... + 8405550.

Almost surely, 2^17993991680 is an apocalyptic number.

17993991680 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 17993991680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25480041048).

17993991680 is an abundant number, since it is smaller than the sum of its proper divisors (32966090416).

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

17993991680 is an equidigital number, since it uses as much as digits as its factorization.

17993991680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245 (or 2222 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 62.

The spelling of 17993991680 in words is "seventeen billion, nine hundred ninety-three million, nine hundred ninety-one thousand, six hundred eighty".