198459555840 has 2048 divisors, whose sum is σ = 951253632000. Its totient is φ = 38050725888.

The previous prime is 198459555829. The next prime is 198459555859. The reversal of 198459555840 is 48555954891.

198459555840 is a `hidden beast` number, since 1 + 9 + 8 + 45 + 9 + 5 + 5 + 584 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2048).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6843432946 + ... + 6843432974.

Almost surely, 2^198459555840 is an apocalyptic number.

198459555840 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 198459555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475626816000).

198459555840 is an abundant number, since it is smaller than the sum of its proper divisors (752794076160).

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

198459555840 is a wasteful number, since it uses less digits than its factorization.

198459555840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 51840000, while the sum is 63.

The spelling of 198459555840 in words is "one hundred ninety-eight billion, four hundred fifty-nine million, five hundred fifty-five thousand, eight hundred forty".