198217794893 has 4 divisors (see below), whose sum is σ = 198410053728. Its totient is φ = 198025536060.

The previous prime is 198217794889. The next prime is 198217794961. The reversal of 198217794893 is 398497712891.

198217794893 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198217794893 - 2² = 198217794889 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 (198217794293) 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, 96127871 + ... + 96129932.

It is an arithmetic number, because the mean of its divisors is an integer number (49602513432).

Almost surely, 2^198217794893 is an apocalyptic number.

It is an amenable number.

198217794893 is a deficient number, since it is larger than the sum of its proper divisors (192258835).

198217794893 is a wasteful number, since it uses less digits than its factorization.

198217794893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192258834.

The product of its digits is 54867456, while the sum is 68.

The spelling of 198217794893 in words is "one hundred ninety-eight billion, two hundred seventeen million, seven hundred ninety-four thousand, eight hundred ninety-three".