16851985869 has 8 divisors (see below), whose sum is σ = 23244118560. Its totient is φ = 10847255216.

The previous prime is 16851985853. The next prime is 16851985901. The reversal of 16851985869 is 96858915861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16851985869 - 2⁴ = 16851985853 is a prime.

It is a super-2 number, since 2×16851985869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851985169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96850407 + ... + 96850580.

It is an arithmetic number, because the mean of its divisors is an integer number (2905514820).

Almost surely, 2^16851985869 is an apocalyptic number.

It is an amenable number.

16851985869 is a deficient number, since it is larger than the sum of its proper divisors (6392132691).

16851985869 is a wasteful number, since it uses less digits than its factorization.

16851985869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193701019.

The product of its digits is 37324800, while the sum is 66.

The spelling of 16851985869 in words is "sixteen billion, eight hundred fifty-one million, nine hundred eighty-five thousand, eight hundred sixty-nine".