198438145357 has 2 divisors, whose sum is σ = 198438145358. Its totient is φ = 198438145356.

The previous prime is 198438145351. The next prime is 198438145421. The reversal of 198438145357 is 753541834891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181800757161 + 16637388196 = 426381^2 + 128986^2 .

It is a cyclic number.

It is not a de Polignac number, because 198438145357 - 2³ = 198438145349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198438145351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99219072678 + 99219072679.

It is an arithmetic number, because the mean of its divisors is an integer number (99219072679).

Almost surely, 2^198438145357 is an apocalyptic number.

It is an amenable number.

198438145357 is a deficient number, since it is larger than the sum of its proper divisors (1).

198438145357 is an equidigital number, since it uses as much as digits as its factorization.

198438145357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 58.

The spelling of 198438145357 in words is "one hundred ninety-eight billion, four hundred thirty-eight million, one hundred forty-five thousand, three hundred fifty-seven".