198879828978891 has 16 divisors (see below), whose sum is σ = 272467865498400. Its totient is φ = 128942538859008.

The previous prime is 198879828978869. The next prime is 198879828978947.

198879828978891 is nontrivially palindromic in base 10.

198879828978891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198879828978891 - 2²¹ = 198879826881739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198879828971891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420550476 + ... + 421023113.

It is an arithmetic number, because the mean of its divisors is an integer number (17029241593650).

Almost surely, 2^{198879828978891} is an apocalyptic number.

198879828978891 is a deficient number, since it is larger than the sum of its proper divisors (73588036519509).

198879828978891 is a wasteful number, since it uses less digits than its factorization.

198879828978891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841575758.

The product of its digits is 168552824832, while the sum is 102.

The spelling of 198879828978891 in words is "one hundred ninety-eight trillion, eight hundred seventy-nine billion, eight hundred twenty-eight million, nine hundred seventy-eight thousand, eight hundred ninety-one".