198791756493 has 16 divisors (see below), whose sum is σ = 290649850176. Its totient is φ = 119855600640.

The previous prime is 198791756489. The next prime is 198791756521. The reversal of 198791756493 is 394657197891.

It is not a de Polignac number, because 198791756493 - 2² = 198791756489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198791756453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15599830 + ... + 15612567.

It is an arithmetic number, because the mean of its divisors is an integer number (18165615636).

Almost surely, 2^198791756493 is an apocalyptic number.

It is an amenable number.

198791756493 is a deficient number, since it is larger than the sum of its proper divisors (91858093683).

198791756493 is a wasteful number, since it uses less digits than its factorization.

198791756493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31212604.

The product of its digits is 102876480, while the sum is 69.

The spelling of 198791756493 in words is "one hundred ninety-eight billion, seven hundred ninety-one million, seven hundred fifty-six thousand, four hundred ninety-three".