198195885487 has 2 divisors, whose sum is σ = 198195885488. Its totient is φ = 198195885486.

The previous prime is 198195885443. The next prime is 198195885527. The reversal of 198195885487 is 784588591891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198195885487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198195885427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99097942743 + 99097942744.

It is an arithmetic number, because the mean of its divisors is an integer number (99097942744).

Almost surely, 2^198195885487 is an apocalyptic number.

198195885487 is a deficient number, since it is larger than the sum of its proper divisors (1).

198195885487 is an equidigital number, since it uses as much as digits as its factorization.

198195885487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 232243200, while the sum is 73.

The spelling of 198195885487 in words is "one hundred ninety-eight billion, one hundred ninety-five million, eight hundred eighty-five thousand, four hundred eighty-seven".