16686866836685 has 16 divisors (see below), whose sum is σ = 20720965587840. Its totient is φ = 12885286962240.

The previous prime is 16686866836603. The next prime is 16686866836687. The reversal of 16686866836685 is 58663866868661.

It is not a de Polignac number, because 16686866836685 - 2²² = 16686862642381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686866836687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16834121 + ... + 17797790.

It is an arithmetic number, because the mean of its divisors is an integer number (1295060349240).

Almost surely, 2^{16686866836685} is an apocalyptic number.

It is an amenable number.

16686866836685 is a deficient number, since it is larger than the sum of its proper divisors (4034098751155).

16686866836685 is a wasteful number, since it uses less digits than its factorization.

16686866836685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34635268.

The product of its digits is 17199267840, while the sum is 83.

The spelling of 16686866836685 in words is "sixteen trillion, six hundred eighty-six billion, eight hundred sixty-six million, eight hundred thirty-six thousand, six hundred eighty-five".