198869968861 has 2 divisors, whose sum is σ = 198869968862. Its totient is φ = 198869968860.

The previous prime is 198869968849. The next prime is 198869968903. The reversal of 198869968861 is 168869968891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186111136836 + 12758832025 = 431406^2 + 112955^2 .

It is a cyclic number.

It is not a de Polignac number, because 198869968861 - 2¹³ = 198869960669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198869968831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99434984430 + 99434984431.

It is an arithmetic number, because the mean of its divisors is an integer number (99434984431).

Almost surely, 2^198869968861 is an apocalyptic number.

It is an amenable number.

198869968861 is a deficient number, since it is larger than the sum of its proper divisors (1).

198869968861 is an equidigital number, since it uses as much as digits as its factorization.

198869968861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 644972544, while the sum is 79.

The spelling of 198869968861 in words is "one hundred ninety-eight billion, eight hundred sixty-nine million, nine hundred sixty-eight thousand, eight hundred sixty-one".