198228562561 has 4 divisors (see below), whose sum is σ = 198374213124. Its totient is φ = 198082912000.

The previous prime is 198228562559. The next prime is 198228562661. The reversal of 198228562561 is 165265822891.

198228562561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124111767025 + 74116795536 = 352295^2 + 272244^2 .

It is a cyclic number.

It is not a de Polignac number, because 198228562561 - 2¹ = 198228562559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198228562501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72823240 + ... + 72825961.

It is an arithmetic number, because the mean of its divisors is an integer number (49593553281).

Almost surely, 2^198228562561 is an apocalyptic number.

It is an amenable number.

198228562561 is a deficient number, since it is larger than the sum of its proper divisors (145650563).

198228562561 is a wasteful number, since it uses less digits than its factorization.

198228562561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145650562.

The product of its digits is 4147200, while the sum is 55.

The spelling of 198228562561 in words is "one hundred ninety-eight billion, two hundred twenty-eight million, five hundred sixty-two thousand, five hundred sixty-one".