16856087285 has 32 divisors (see below), whose sum is σ = 20882534400. Its totient is φ = 13055042880.

The previous prime is 16856087263. The next prime is 16856087317. The reversal of 16856087285 is 58278065861.

It is a happy number.

It is not a de Polignac number, because 16856087285 - 2⁸ = 16856087029 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16856087285.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10811336 + ... + 10812894.

It is an arithmetic number, because the mean of its divisors is an integer number (652579200).

Almost surely, 2^16856087285 is an apocalyptic number.

It is an amenable number.

16856087285 is a deficient number, since it is larger than the sum of its proper divisors (4026447115).

16856087285 is a wasteful number, since it uses less digits than its factorization.

16856087285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081.

The product of its (nonzero) digits is 6451200, while the sum is 56.

The spelling of 16856087285 in words is "sixteen billion, eight hundred fifty-six million, eighty-seven thousand, two hundred eighty-five".