198395581440 has 352 divisors, whose sum is σ = 767872998144. Its totient is φ = 42679664640.

The previous prime is 198395581429. The next prime is 198395581499. The reversal of 198395581440 is 44185593891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1773570 + ... + 1882110.

Almost surely, 2^198395581440 is an apocalyptic number.

198395581440 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 198395581440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383936499072).

198395581440 is an abundant number, since it is smaller than the sum of its proper divisors (569477416704).

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

198395581440 is a wasteful number, since it uses less digits than its factorization.

198395581440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108593 (or 108575 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 57.

The spelling of 198395581440 in words is "one hundred ninety-eight billion, three hundred ninety-five million, five hundred eighty-one thousand, four hundred forty".