198361705789 has 4 divisors (see below), whose sum is σ = 213620298556. Its totient is φ = 183103113024.

The previous prime is 198361705777. The next prime is 198361705799. The reversal of 198361705789 is 987507163891.

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 30794283289 + 167567422500 = 175483^2 + 409350^2 .

It is not a de Polignac number, because 198361705789 - 2¹¹ = 198361703741 is a prime.

It is a super-2 number, since 2×198361705789² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198361705789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198361705739) 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, 7629296364 + ... + 7629296389.

It is an arithmetic number, because the mean of its divisors is an integer number (53405074639).

Almost surely, 2^198361705789 is an apocalyptic number.

It is an amenable number.

198361705789 is a deficient number, since it is larger than the sum of its proper divisors (15258592767).

198361705789 is a wasteful number, since it uses less digits than its factorization.

198361705789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15258592766.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 198361705789 in words is "one hundred ninety-eight billion, three hundred sixty-one million, seven hundred five thousand, seven hundred eighty-nine".