198805180687 has 2 divisors, whose sum is σ = 198805180688. Its totient is φ = 198805180686.

The previous prime is 198805180643. The next prime is 198805180699. The reversal of 198805180687 is 786081508891.

198805180687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198805180687 - 2¹¹ = 198805178639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198805180787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99402590343 + 99402590344.

It is an arithmetic number, because the mean of its divisors is an integer number (99402590344).

Almost surely, 2^198805180687 is an apocalyptic number.

198805180687 is a deficient number, since it is larger than the sum of its proper divisors (1).

198805180687 is an equidigital number, since it uses as much as digits as its factorization.

198805180687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 61.

The spelling of 198805180687 in words is "one hundred ninety-eight billion, eight hundred five million, one hundred eighty thousand, six hundred eighty-seven".