198745581636 has 336 divisors, whose sum is σ = 606840595200. Its totient is φ = 55758585600.

The previous prime is 198745581623. The next prime is 198745581689. The reversal of 198745581636 is 636185547891.

198745581636 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 45 + 581 + 6 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 307179865 + ... + 307180511.

It is an arithmetic number, because the mean of its divisors is an integer number (1806073200).

Almost surely, 2^198745581636 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 198745581636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303420297600).

198745581636 is an abundant number, since it is smaller than the sum of its proper divisors (408095013564).

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

198745581636 is a wasteful number, since it uses less digits than its factorization.

198745581636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 909 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 63.

The spelling of 198745581636 in words is "one hundred ninety-eight billion, seven hundred forty-five million, five hundred eighty-one thousand, six hundred thirty-six".