16685186867477 has 2 divisors, whose sum is σ = 16685186867478. Its totient is φ = 16685186867476.

The previous prime is 16685186867413. The next prime is 16685186867491. The reversal of 16685186867477 is 77476868158661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16565217461521 + 119969405956 = 4070039^2 + 346366^2 .

It is a cyclic number.

It is not a de Polignac number, because 16685186867477 - 2⁶ = 16685186867413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16685186807477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342593433738 + 8342593433739.

It is an arithmetic number, because the mean of its divisors is an integer number (8342593433739).

Almost surely, 2^{16685186867477} is an apocalyptic number.

It is an amenable number.

16685186867477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685186867477 is an equidigital number, since it uses as much as digits as its factorization.

16685186867477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4551966720, while the sum is 80.

The spelling of 16685186867477 in words is "sixteen trillion, six hundred eighty-five billion, one hundred eighty-six million, eight hundred sixty-seven thousand, four hundred seventy-seven".