198363781801836 has 144 divisors (see below), whose sum is σ = 581170721983488. Its totient is φ = 55872443088000.

The previous prime is 198363781801831. The next prime is 198363781801847. The reversal of 198363781801836 is 638108187363891.

198363781801836 is a `hidden beast` number, since 1 + 9 + 8 + 36 + 378 + 180 + 18 + 36 = 666.

It is not an unprimeable number, because it can be changed into a prime (198363781801831) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216053001 + ... + 216969183.

It is an arithmetic number, because the mean of its divisors is an integer number (4035907791552).

Almost surely, 2^{198363781801836} 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 198363781801836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290585360991744).

198363781801836 is an abundant number, since it is smaller than the sum of its proper divisors (382806940181652).

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

198363781801836 is a wasteful number, since it uses less digits than its factorization.

198363781801836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928372 (or 928367 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 72.

The spelling of 198363781801836 in words is "one hundred ninety-eight trillion, three hundred sixty-three billion, seven hundred eighty-one million, eight hundred one thousand, eight hundred thirty-six".