198818867057 has 2 divisors, whose sum is σ = 198818867058. Its totient is φ = 198818867056.

The previous prime is 198818867017. The next prime is 198818867099. The reversal of 198818867057 is 750768818891.

198818867057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180645400576 + 18173466481 = 425024^2 + 134809^2 .

It is a cyclic number.

It is not a de Polignac number, because 198818867057 - 2⁶ = 198818866993 is a prime.

It is a super-3 number, since 3×198818867057³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (198818867017) 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 as a sum of consecutive naturals, namely, 99409433528 + 99409433529.

It is an arithmetic number, because the mean of its divisors is an integer number (99409433529).

Almost surely, 2^198818867057 is an apocalyptic number.

It is an amenable number.

198818867057 is a deficient number, since it is larger than the sum of its proper divisors (1).

198818867057 is an equidigital number, since it uses as much as digits as its factorization.

198818867057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54190080, while the sum is 68.

The spelling of 198818867057 in words is "one hundred ninety-eight billion, eight hundred eighteen million, eight hundred sixty-seven thousand, fifty-seven".