1988173990218 has 16 divisors (see below), whose sum is σ = 4282220902176. Its totient is φ = 611745843120.

The previous prime is 1988173990211. The next prime is 1988173990303. The reversal of 1988173990218 is 8120993718891.

It is not an unprimeable number, because it can be changed into a prime (1988173990211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12744704988 + ... + 12744705143.

It is an arithmetic number, because the mean of its divisors is an integer number (267638806386).

Almost surely, 2^{1988173990218} is an apocalyptic number.

1988173990218 is an abundant number, since it is smaller than the sum of its proper divisors (2294046911958).

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

1988173990218 is a wasteful number, since it uses less digits than its factorization.

1988173990218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25489410149.

The product of its (nonzero) digits is 15676416, while the sum is 66.

The spelling of 1988173990218 in words is "one trillion, nine hundred eighty-eight billion, one hundred seventy-three million, nine hundred ninety thousand, two hundred eighteen".