198346660126561 has 4 divisors (see below), whose sum is σ = 203184383544324. Its totient is φ = 193508936708800.

The previous prime is 198346660126463. The next prime is 198346660126567. The reversal of 198346660126561 is 165621066643891.

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 8850952253025 + 189495707873536 = 2975055^2 + 13765744^2 .

It is a cyclic number.

It is not a de Polignac number, because 198346660126561 - 2¹¹ = 198346660124513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198346660126493 and 198346660126502.

It is not an unprimeable number, because it can be changed into a prime (198346660126567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2418861708820 + ... + 2418861708901.

It is an arithmetic number, because the mean of its divisors is an integer number (50796095886081).

Almost surely, 2^{198346660126561} is an apocalyptic number.

It is an amenable number.

198346660126561 is a deficient number, since it is larger than the sum of its proper divisors (4837723417763).

198346660126561 is an equidigital number, since it uses as much as digits as its factorization.

198346660126561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837723417762.

The product of its (nonzero) digits is 67184640, while the sum is 64.

The spelling of 198346660126561 in words is "one hundred ninety-eight trillion, three hundred forty-six billion, six hundred sixty million, one hundred twenty-six thousand, five hundred sixty-one".