16686188377 has 2 divisors, whose sum is σ = 16686188378. Its totient is φ = 16686188376.

The previous prime is 16686188353. The next prime is 16686188383. The reversal of 16686188377 is 77388168661.

It is a happy number.

16686188377 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 can be written as a sum of positive squares in only one way, i.e., 9748797696 + 6937390681 = 98736^2 + 83291^2 .

It is an emirp because it is prime and its reverse (77388168661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16686188377 - 2⁷ = 16686188249 is a prime.

It is not a weakly prime, because it can be changed into another prime (16686188317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343094188 + 8343094189.

It is an arithmetic number, because the mean of its divisors is an integer number (8343094189).

Almost surely, 2^16686188377 is an apocalyptic number.

It is an amenable number.

16686188377 is a deficient number, since it is larger than the sum of its proper divisors (1).

16686188377 is an equidigital number, since it uses as much as digits as its factorization.

16686188377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 61.

The spelling of 16686188377 in words is "sixteen billion, six hundred eighty-six million, one hundred eighty-eight thousand, three hundred seventy-seven".