198780198136 has 64 divisors (see below), whose sum is σ = 414630881280. Its totient is φ = 88720928640.

The previous prime is 198780198101. The next prime is 198780198151. The reversal of 198780198136 is 631891087891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4579045 + ... + 4622251.

It is an arithmetic number, because the mean of its divisors is an integer number (6478607520).

Almost surely, 2^198780198136 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 198780198136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207315440640).

198780198136 is an abundant number, since it is smaller than the sum of its proper divisors (215850683144).

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

198780198136 is a wasteful number, since it uses less digits than its factorization.

198780198136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44684 (or 44680 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 198780198136 in words is "one hundred ninety-eight billion, seven hundred eighty million, one hundred ninety-eight thousand, one hundred thirty-six".