198585205642 has 16 divisors (see below), whose sum is σ = 298081197000. Its totient is φ = 99224835840.

The previous prime is 198585205549. The next prime is 198585205649. The reversal of 198585205642 is 246502585891.

198585205642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 445629²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 186839198001 + 11746007641 = 432249^2 + 108379^2 .

It is not an unprimeable number, because it can be changed into a prime (198585205649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29809792 + ... + 29816452.

Almost surely, 2^198585205642 is an apocalyptic number.

198585205642 is a deficient number, since it is larger than the sum of its proper divisors (99495991358).

198585205642 is a wasteful number, since it uses less digits than its factorization.

198585205642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14601.

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 198585205642 in words is "one hundred ninety-eight billion, five hundred eighty-five million, two hundred five thousand, six hundred forty-two".