198438175357 has 2 divisors, whose sum is σ = 198438175358. Its totient is φ = 198438175356.

The previous prime is 198438175289. The next prime is 198438175379. The reversal of 198438175357 is 753571834891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112534082521 + 85904092836 = 335461^2 + 293094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198438175357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198438175295 and 198438175304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198438145357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99219087678 + 99219087679.

It is an arithmetic number, because the mean of its divisors is an integer number (99219087679).

Almost surely, 2^198438175357 is an apocalyptic number.

It is an amenable number.

198438175357 is a deficient number, since it is larger than the sum of its proper divisors (1).

198438175357 is an equidigital number, since it uses as much as digits as its factorization.

198438175357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 61.

Subtracting from 198438175357 its sum of digits (61), we obtain a square (198438175296 = 445464²).

The spelling of 198438175357 in words is "one hundred ninety-eight billion, four hundred thirty-eight million, one hundred seventy-five thousand, three hundred fifty-seven".