16856543713 has 4 divisors (see below), whose sum is σ = 16857992368. Its totient is φ = 16855095060.

The previous prime is 16856543707. The next prime is 16856543801. The reversal of 16856543713 is 31734565861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31734565861 = 83 ⋅382344167.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16856543713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16856543113) 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, 706731 + ... + 730192.

It is an arithmetic number, because the mean of its divisors is an integer number (4214498092).

Almost surely, 2^16856543713 is an apocalyptic number.

It is an amenable number.

16856543713 is a deficient number, since it is larger than the sum of its proper divisors (1448655).

16856543713 is a wasteful number, since it uses less digits than its factorization.

16856543713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448654.

The product of its digits is 1814400, while the sum is 49.

The spelling of 16856543713 in words is "sixteen billion, eight hundred fifty-six million, five hundred forty-three thousand, seven hundred thirteen".