198539585749 has 2 divisors, whose sum is σ = 198539585750. Its totient is φ = 198539585748.

The previous prime is 198539585659. The next prime is 198539585759. The reversal of 198539585749 is 947585935891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153345077649 + 45194508100 = 391593^2 + 212590^2 .

It is a cyclic number.

It is not a de Polignac number, because 198539585749 - 2¹¹ = 198539583701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198539585759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99269792874 + 99269792875.

It is an arithmetic number, because the mean of its divisors is an integer number (99269792875).

Almost surely, 2^198539585749 is an apocalyptic number.

It is an amenable number.

198539585749 is a deficient number, since it is larger than the sum of its proper divisors (1).

198539585749 is an equidigital number, since it uses as much as digits as its factorization.

198539585749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888000, while the sum is 73.

The spelling of 198539585749 in words is "one hundred ninety-eight billion, five hundred thirty-nine million, five hundred eighty-five thousand, seven hundred forty-nine".