1980198173880 has 384 divisors, whose sum is σ = 6924608870400. Its totient is φ = 489184413696.

The previous prime is 1980198173827. The next prime is 1980198173929. The reversal of 1980198173880 is 883718910891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 516616444 + ... + 516620276.

It is an arithmetic number, because the mean of its divisors is an integer number (18032835600).

Almost surely, 2^{1980198173880} is an apocalyptic number.

1980198173880 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 1980198173880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3462304435200).

1980198173880 is an abundant number, since it is smaller than the sum of its proper divisors (4944410696520).

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

1980198173880 is a wasteful number, since it uses less digits than its factorization.

1980198173880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523 (or 5516 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 63.

The spelling of 1980198173880 in words is "one trillion, nine hundred eighty billion, one hundred ninety-eight million, one hundred seventy-three thousand, eight hundred eighty".