198195885541 has 2 divisors, whose sum is σ = 198195885542. Its totient is φ = 198195885540.

The previous prime is 198195885527. The next prime is 198195885571. The reversal of 198195885541 is 145588591891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111242260900 + 86953624641 = 333530^2 + 294879^2 .

It is an emirp because it is prime and its reverse (145588591891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198195885541 - 2¹⁵ = 198195852773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198195885571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99097942770 + 99097942771.

It is an arithmetic number, because the mean of its divisors is an integer number (99097942771).

Almost surely, 2^198195885541 is an apocalyptic number.

It is an amenable number.

198195885541 is a deficient number, since it is larger than the sum of its proper divisors (1).

198195885541 is an equidigital number, since it uses as much as digits as its factorization.

198195885541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736000, while the sum is 64.

The spelling of 198195885541 in words is "one hundred ninety-eight billion, one hundred ninety-five million, eight hundred eighty-five thousand, five hundred forty-one".