198545646545891 has 4 divisors (see below), whose sum is σ = 199247221268952. Its totient is φ = 197844071822832.

The previous prime is 198545646545879. The next prime is 198545646545947.

198545646545891 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198545646545891 - 2¹⁴ = 198545646529507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198545646547891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350787361106 + ... + 350787361671.

It is an arithmetic number, because the mean of its divisors is an integer number (49811805317238).

Almost surely, 2^{198545646545891} is an apocalyptic number.

198545646545891 is a deficient number, since it is larger than the sum of its proper divisors (701574723061).

198545646545891 is an equidigital number, since it uses as much as digits as its factorization.

198545646545891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701574723060.

The product of its digits is 7464960000, while the sum is 80.

The spelling of 198545646545891 in words is "one hundred ninety-eight trillion, five hundred forty-five billion, six hundred forty-six million, five hundred forty-five thousand, eight hundred ninety-one".