16686838646783 has 4 divisors (see below), whose sum is σ = 16697406627240. Its totient is φ = 16676270666328.

The previous prime is 16686838646741. The next prime is 16686838646789. The reversal of 16686838646783 is 38764683868661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16686838646783 - 2⁶ = 16686838646719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16686838646698 and 16686838646707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686838646789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5283987860 + ... + 5283991017.

It is an arithmetic number, because the mean of its divisors is an integer number (4174351656810).

Almost surely, 2^{16686838646783} is an apocalyptic number.

16686838646783 is a deficient number, since it is larger than the sum of its proper divisors (10567980457).

16686838646783 is a wasteful number, since it uses less digits than its factorization.

16686838646783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10567980456.

The product of its digits is 8026324992, while the sum is 80.

The spelling of 16686838646783 in words is "sixteen trillion, six hundred eighty-six billion, eight hundred thirty-eight million, six hundred forty-six thousand, seven hundred eighty-three".