198581288893 has 8 divisors (see below), whose sum is σ = 216259659000. Its totient is φ = 181246188288.

The previous prime is 198581288891. The next prime is 198581288897. The reversal of 198581288893 is 398882185891.

It can be written as a sum of positive squares in 4 ways, for example, as 31874032089 + 166707256804 = 178533^2 + 408298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198581288893 - 2¹ = 198581288891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198581288891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85816168 + ... + 85818481.

It is an arithmetic number, because the mean of its divisors is an integer number (27032457375).

Almost surely, 2^198581288893 is an apocalyptic number.

198581288893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

198581288893 is a deficient number, since it is larger than the sum of its proper divisors (17678370107).

198581288893 is a wasteful number, since it uses less digits than its factorization.

198581288893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171634751.

The product of its digits is 79626240, while the sum is 70.

The spelling of 198581288893 in words is "one hundred ninety-eight billion, five hundred eighty-one million, two hundred eighty-eight thousand, eight hundred ninety-three".