1998003458880 has 2016 divisors, whose sum is σ = 8626934744064. Its totient is φ = 420913152000.

The previous prime is 1998003458879. The next prime is 1998003458933. The reversal of 1998003458880 is 888543008991.

It is a happy number.

1998003458880 is a `hidden beast` number, since 19 + 9 + 8 + 0 + 0 + 34 + 588 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 5757934867 + ... + 5757935213.

It is an arithmetic number, because the mean of its divisors is an integer number (4279233504).

Almost surely, 2^{1998003458880} is an apocalyptic number.

1998003458880 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 1998003458880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4313467372032).

1998003458880 is an abundant number, since it is smaller than the sum of its proper divisors (6628931285184).

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

1998003458880 is a wasteful number, since it uses less digits than its factorization.

1998003458880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 1998003458880 in words is "one trillion, nine hundred ninety-eight billion, three million, four hundred fifty-eight thousand, eight hundred eighty".