199998956844 has 90 divisors (see below), whose sum is σ = 537350606100. Its totient is φ = 64864382688.

The previous prime is 199998956813. The next prime is 199998956867. The reversal of 199998956844 is 448659899991.

199998956844 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 9 + 8 + 9 + 568 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 218107 + ... + 669005.

It is an arithmetic number, because the mean of its divisors is an integer number (5970562290).

Almost surely, 2^199998956844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199998956844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268675303050).

199998956844 is an abundant number, since it is smaller than the sum of its proper divisors (337351649256).

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

199998956844 is a wasteful number, since it uses less digits than its factorization.

199998956844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450989 (or 450941 counting only the distinct ones).

The product of its digits is 1813985280, while the sum is 81.

The spelling of 199998956844 in words is "one hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred fifty-six thousand, eight hundred forty-four".