198375779121 has 16 divisors (see below), whose sum is σ = 285092262336. Its totient is φ = 121972406976.

The previous prime is 198375779113. The next prime is 198375779131. The reversal of 198375779121 is 121977573891.

It is not a de Polignac number, because 198375779121 - 2³ = 198375779113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198375779131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2141470 + ... + 2232183.

It is an arithmetic number, because the mean of its divisors is an integer number (17818266396).

Almost surely, 2^198375779121 is an apocalyptic number.

It is an amenable number.

198375779121 is a deficient number, since it is larger than the sum of its proper divisors (86716483215).

198375779121 is a wasteful number, since it uses less digits than its factorization.

198375779121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374832.

The product of its digits is 6667920, while the sum is 60.

The spelling of 198375779121 in words is "one hundred ninety-eight billion, three hundred seventy-five million, seven hundred seventy-nine thousand, one hundred twenty-one".