198073857891 has 32 divisors (see below), whose sum is σ = 342151882240. Its totient is φ = 98979646464.

The previous prime is 198073857857. The next prime is 198073857911. The reversal of 198073857891 is 198758370891.

It is not a de Polignac number, because 198073857891 - 2⁶ = 198073857827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198073857811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19088110 + ... + 19098483.

It is an arithmetic number, because the mean of its divisors is an integer number (10692246320).

Almost surely, 2^198073857891 is an apocalyptic number.

198073857891 is a deficient number, since it is larger than the sum of its proper divisors (144078024349).

198073857891 is a wasteful number, since it uses less digits than its factorization.

198073857891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38186635.

The product of its (nonzero) digits is 30481920, while the sum is 66.

The spelling of 198073857891 in words is "one hundred ninety-eight billion, seventy-three million, eight hundred fifty-seven thousand, eight hundred ninety-one".