16866851687 has 6 divisors (see below), whose sum is σ = 19620623448. Its totient is φ = 14457301404.

The previous prime is 16866851663. The next prime is 16866851713. The reversal of 16866851687 is 78615866861.

It is not a de Polignac number, because 16866851687 - 2²⁸ = 16598416231 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 (16866851987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 172110683 + ... + 172110780.

It is an arithmetic number, because the mean of its divisors is an integer number (3270103908).

Almost surely, 2^16866851687 is an apocalyptic number.

16866851687 is a deficient number, since it is larger than the sum of its proper divisors (2753771761).

16866851687 is an equidigital number, since it uses as much as digits as its factorization.

16866851687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344221477 (or 344221470 counting only the distinct ones).

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

The spelling of 16866851687 in words is "sixteen billion, eight hundred sixty-six million, eight hundred fifty-one thousand, six hundred eighty-seven".