198869968891 has 8 divisors (see below), whose sum is σ = 219055359744. Its totient is φ = 179035628520.

The previous prime is 198869968861. The next prime is 198869968903.

198869968891 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198869968891 - 2¹³ = 198869960699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198869968831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87761431 + ... + 87763696.

It is an arithmetic number, because the mean of its divisors is an integer number (27381919968).

Almost surely, 2^198869968891 is an apocalyptic number.

198869968891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198869968891 is a deficient number, since it is larger than the sum of its proper divisors (20185390853).

198869968891 is a wasteful number, since it uses less digits than its factorization.

198869968891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175525241.

The product of its digits is 967458816, while the sum is 82.

The spelling of 198869968891 in words is "one hundred ninety-eight billion, eight hundred sixty-nine million, nine hundred sixty-eight thousand, eight hundred ninety-one".