198686655929 has 2 divisors, whose sum is σ = 198686655930. Its totient is φ = 198686655928.

The previous prime is 198686655889. The next prime is 198686655991. The reversal of 198686655929 is 929556686891.

198686655929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143250895225 + 55435760704 = 378485^2 + 235448^2 .

It is a cyclic number.

It is not a de Polignac number, because 198686655929 - 2¹⁶ = 198686590393 is a prime.

It is not a weakly prime, because it can be changed into another prime (198686657929) 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 as a sum of consecutive naturals, namely, 99343327964 + 99343327965.

It is an arithmetic number, because the mean of its divisors is an integer number (99343327965).

Almost surely, 2^198686655929 is an apocalyptic number.

It is an amenable number.

198686655929 is a deficient number, since it is larger than the sum of its proper divisors (1).

198686655929 is an equidigital number, since it uses as much as digits as its factorization.

198686655929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 503884800, while the sum is 74.

The spelling of 198686655929 in words is "one hundred ninety-eight billion, six hundred eighty-six million, six hundred fifty-five thousand, nine hundred twenty-nine".