198255902961 has 4 divisors (see below), whose sum is σ = 264341203952. Its totient is φ = 132170601972.

The previous prime is 198255902953. The next prime is 198255902993. The reversal of 198255902961 is 169209552891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 198255902961 - 2³ = 198255902953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198255902261) 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 3 ways as a sum of consecutive naturals, for example, 33042650491 + ... + 33042650496.

It is an arithmetic number, because the mean of its divisors is an integer number (66085300988).

Almost surely, 2^198255902961 is an apocalyptic number.

It is an amenable number.

198255902961 is a deficient number, since it is larger than the sum of its proper divisors (66085300991).

198255902961 is an equidigital number, since it uses as much as digits as its factorization.

198255902961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66085300990.

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 198255902961 in words is "one hundred ninety-eight billion, two hundred fifty-five million, nine hundred two thousand, nine hundred sixty-one".