16851686687 has 8 divisors (see below), whose sum is σ = 18384630912. Its totient is φ = 15318904600.

The previous prime is 16851686669. The next prime is 16851686689. The reversal of 16851686687 is 78668615861.

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 16851686687 - 2⁶ = 16851686623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851686689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304598 + ... + 355644.

It is an arithmetic number, because the mean of its divisors is an integer number (2298078864).

Almost surely, 2^16851686687 is an apocalyptic number.

16851686687 is a deficient number, since it is larger than the sum of its proper divisors (1532944225).

16851686687 is a wasteful number, since it uses less digits than its factorization.

16851686687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81069.

The product of its digits is 23224320, while the sum is 62.

The spelling of 16851686687 in words is "sixteen billion, eight hundred fifty-one million, six hundred eighty-six thousand, six hundred eighty-seven".