16685186868799 has 2 divisors, whose sum is σ = 16685186868800. Its totient is φ = 16685186868798.

The previous prime is 16685186868737. The next prime is 16685186868809. The reversal of 16685186868799 is 99786868158661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16685186868799 - 2³¹ = 16683039385151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16685186863799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342593434399 + 8342593434400.

It is an arithmetic number, because the mean of its divisors is an integer number (8342593434400).

Almost surely, 2^{16685186868799} is an apocalyptic number.

16685186868799 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685186868799 is an equidigital number, since it uses as much as digits as its factorization.

16685186868799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15049359360, while the sum is 88.

The spelling of 16685186868799 in words is "sixteen trillion, six hundred eighty-five billion, one hundred eighty-six million, eight hundred sixty-eight thousand, seven hundred ninety-nine".