198542378736 has 120 divisors (see below), whose sum is σ = 600017221440. Its totient is φ = 60923294208.

The previous prime is 198542378707. The next prime is 198542378761. The reversal of 198542378736 is 637873245891.

198542378736 is a `hidden beast` number, since 1 + 9 + 8 + 542 + 3 + 7 + 87 + 3 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 542530 + ... + 831518.

It is an arithmetic number, because the mean of its divisors is an integer number (5000143512).

Almost surely, 2^198542378736 is an apocalyptic number.

198542378736 is a gapful number since it is divisible by the number (16) 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 198542378736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300008610720).

198542378736 is an abundant number, since it is smaller than the sum of its proper divisors (401474842704).

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

198542378736 is a wasteful number, since it uses less digits than its factorization.

198542378736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289383 (or 289374 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 198542378736 in words is "one hundred ninety-eight billion, five hundred forty-two million, three hundred seventy-eight thousand, seven hundred thirty-six".