1686685020185 has 16 divisors (see below), whose sum is σ = 2229885657792. Its totient is φ = 1214534664000.

The previous prime is 1686685020179. The next prime is 1686685020187. The reversal of 1686685020185 is 5810205866861.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1686685020185 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686685020185.

It is not an unprimeable number, because it can be changed into a prime (1686685020187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151811279 + ... + 151822388.

It is an arithmetic number, because the mean of its divisors is an integer number (139367853612).

Almost surely, 2^{1686685020185} is an apocalyptic number.

It is an amenable number.

1686685020185 is a deficient number, since it is larger than the sum of its proper divisors (543200637607).

1686685020185 is a wasteful number, since it uses less digits than its factorization.

1686685020185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303633784.

The product of its (nonzero) digits is 5529600, while the sum is 56.

The spelling of 1686685020185 in words is "one trillion, six hundred eighty-six billion, six hundred eighty-five million, twenty thousand, one hundred eighty-five".