198078268873 has 4 divisors (see below), whose sum is σ = 200120312980. Its totient is φ = 196036224768.

The previous prime is 198078268853. The next prime is 198078268877. The reversal of 198078268873 is 378862870891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378862870891 = 16267 ⋅23290273.

It can be written as a sum of positive squares in 2 ways, for example, as 160477956409 + 37600312464 = 400597^2 + 193908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198078268873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198078268799 and 198078268808.

It is not an unprimeable number, because it can be changed into a prime (198078268877) 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, 1021021908 + ... + 1021022101.

It is an arithmetic number, because the mean of its divisors is an integer number (50030078245).

Almost surely, 2^198078268873 is an apocalyptic number.

It is an amenable number.

198078268873 is a deficient number, since it is larger than the sum of its proper divisors (2042044107).

198078268873 is an equidigital number, since it uses as much as digits as its factorization.

198078268873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042044106.

The product of its (nonzero) digits is 65028096, while the sum is 67.

The spelling of 198078268873 in words is "one hundred ninety-eight billion, seventy-eight million, two hundred sixty-eight thousand, eight hundred seventy-three".