198975432128 has 112 divisors (see below), whose sum is σ = 457539754464. Its totient is φ = 84849623040.

The previous prime is 198975432127. The next prime is 198975432209. The reversal of 198975432128 is 821234579891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198975432127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3719426 + ... + 3772542.

Almost surely, 2^198975432128 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 198975432128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228769877232).

198975432128 is an abundant number, since it is smaller than the sum of its proper divisors (258564322336).

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

198975432128 is a wasteful number, since it uses less digits than its factorization.

198975432128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53470 (or 53460 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 59.

The spelling of 198975432128 in words is "one hundred ninety-eight billion, nine hundred seventy-five million, four hundred thirty-two thousand, one hundred twenty-eight".