198689602106 has 4 divisors (see below), whose sum is σ = 298034403162. Its totient is φ = 99344801052.

The previous prime is 198689602099. The next prime is 198689602109. The reversal of 198689602106 is 601206986891.

It is a happy number.

198689602106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 198065052025 + 624550081 = 445045^2 + 24991^2 .

It is not an unprimeable number, because it can be changed into a prime (198689602109) 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, 49672400525 + ... + 49672400528.

Almost surely, 2^198689602106 is an apocalyptic number.

198689602106 is a deficient number, since it is larger than the sum of its proper divisors (99344801056).

198689602106 is an equidigital number, since it uses as much as digits as its factorization.

198689602106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99344801055.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 198689602106 in words is "one hundred ninety-eight billion, six hundred eighty-nine million, six hundred two thousand, one hundred six".