16685186868473 has 2 divisors, whose sum is σ = 16685186868474. Its totient is φ = 16685186868472.

The previous prime is 16685186868463. The next prime is 16685186868481. The reversal of 16685186868473 is 37486868158661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8489717618944 + 8195469249529 = 2913712^2 + 2862773^2 .

It is a cyclic number.

It is not a de Polignac number, because 16685186868473 - 2³⁰ = 16684113126649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16685186868394 and 16685186868403.

It is not a weakly prime, because it can be changed into another prime (16685186868463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8342593434236 + 8342593434237.

It is an arithmetic number, because the mean of its divisors is an integer number (8342593434237).

Almost surely, 2^{16685186868473} is an apocalyptic number.

It is an amenable number.

16685186868473 is a deficient number, since it is larger than the sum of its proper divisors (1).

16685186868473 is an equidigital number, since it uses as much as digits as its factorization.

16685186868473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2229534720, while the sum is 77.

The spelling of 16685186868473 in words is "sixteen trillion, six hundred eighty-five billion, one hundred eighty-six million, eight hundred sixty-eight thousand, four hundred seventy-three".