185486868989 has 2 divisors, whose sum is σ = 185486868990. Its totient is φ = 185486868988.

The previous prime is 185486868937. The next prime is 185486869037. The reversal of 185486868989 is 989868684581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143381880964 + 42104988025 = 378658^2 + 205195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185486868989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185486868689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92743434494 + 92743434495.

It is an arithmetic number, because the mean of its divisors is an integer number (92743434495).

Almost surely, 2^185486868989 is an apocalyptic number.

It is an amenable number.

185486868989 is a deficient number, since it is larger than the sum of its proper divisors (1).

185486868989 is an equidigital number, since it uses as much as digits as its factorization.

185486868989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1911029760, while the sum is 80.

The spelling of 185486868989 in words is "one hundred eighty-five billion, four hundred eighty-six million, eight hundred sixty-eight thousand, nine hundred eighty-nine".