1998550581300 has 1152 divisors, whose sum is σ = 8813835878400. Its totient is φ = 375965245440.

The previous prime is 1998550581277. The next prime is 1998550581331. The reversal of 1998550581300 is 31850558991.

It is a happy number.

1998550581300 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 5 + 50 + 581 + 3 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 79348509 + ... + 79373691.

It is an arithmetic number, because the mean of its divisors is an integer number (7650899200).

Almost surely, 2^{1998550581300} is an apocalyptic number.

1998550581300 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 1998550581300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4406917939200).

1998550581300 is an abundant number, since it is smaller than the sum of its proper divisors (6815285297100).

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

1998550581300 is a wasteful number, since it uses less digits than its factorization.

1998550581300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25262 (or 25249 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 54.

The spelling of 1998550581300 in words is "one trillion, nine hundred ninety-eight billion, five hundred fifty million, five hundred eighty-one thousand, three hundred".