198845011993 has 4 divisors (see below), whose sum is σ = 209310538960. Its totient is φ = 188379485028.

The previous prime is 198845011931. The next prime is 198845011997. The reversal of 198845011993 is 399110548891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 399110548891 = 333397 ⋅1197103.

It is a cyclic number.

It is not a de Polignac number, because 198845011993 - 2²⁵ = 198811457561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198845011997) 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, 5232763455 + ... + 5232763492.

It is an arithmetic number, because the mean of its divisors is an integer number (52327634740).

Almost surely, 2^198845011993 is an apocalyptic number.

It is an amenable number.

198845011993 is a deficient number, since it is larger than the sum of its proper divisors (10465526967).

198845011993 is a wasteful number, since it uses less digits than its factorization.

198845011993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465526966.

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 198845011993 in words is "one hundred ninety-eight billion, eight hundred forty-five million, eleven thousand, nine hundred ninety-three".