198373373891 has 72 divisors (see below), whose sum is σ = 267986390112. Its totient is φ = 143666265600.

The previous prime is 198373373797. The next prime is 198373373909.

198373373891 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 198373373891 - 2²² = 198369179587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198373375891) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16199531 + ... + 16211771.

It is an arithmetic number, because the mean of its divisors is an integer number (3722033196).

Almost surely, 2^198373373891 is an apocalyptic number.

198373373891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198373373891 is a deficient number, since it is larger than the sum of its proper divisors (69613016221).

198373373891 is a wasteful number, since it uses less digits than its factorization.

198373373891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12361 (or 12331 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 62.

The spelling of 198373373891 in words is "one hundred ninety-eight billion, three hundred seventy-three million, three hundred seventy-three thousand, eight hundred ninety-one".