186668684789 has 2 divisors, whose sum is σ = 186668684790. Its totient is φ = 186668684788.

The previous prime is 186668684759. The next prime is 186668684801. The reversal of 186668684789 is 987486866681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184678186564 + 1990498225 = 429742^2 + 44615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-186668684789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186668684749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93334342394 + 93334342395.

It is an arithmetic number, because the mean of its divisors is an integer number (93334342395).

Almost surely, 2^186668684789 is an apocalyptic number.

It is an amenable number.

186668684789 is a deficient number, since it is larger than the sum of its proper divisors (1).

186668684789 is an equidigital number, since it uses as much as digits as its factorization.

186668684789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1337720832, while the sum is 77.

The spelling of 186668684789 in words is "one hundred eighty-six billion, six hundred sixty-eight million, six hundred eighty-four thousand, seven hundred eighty-nine".