198686655925 has 6 divisors (see below), whose sum is σ = 246371453378. Its totient is φ = 158949324720.

The previous prime is 198686655889. The next prime is 198686655929. The reversal of 198686655925 is 529556686891.

It is a happy number.

198686655925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 30580915876 + 168105740049 = 174874^2 + 410007^2 .

It is not a de Polignac number, because 198686655925 - 2¹¹ = 198686653877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198686655929) 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 5 ways as a sum of consecutive naturals, for example, 3973733094 + ... + 3973733143.

Almost surely, 2^198686655925 is an apocalyptic number.

It is an amenable number.

198686655925 is a deficient number, since it is larger than the sum of its proper divisors (47684797453).

198686655925 is an equidigital number, since it uses as much as digits as its factorization.

198686655925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7947466247 (or 7947466242 counting only the distinct ones).

The product of its digits is 279936000, while the sum is 70.

The spelling of 198686655925 in words is "one hundred ninety-eight billion, six hundred eighty-six million, six hundred fifty-five thousand, nine hundred twenty-five".