1686681577218 has 32 divisors (see below), whose sum is σ = 3699299745792. Its totient is φ = 508439627600.

The previous prime is 1686681577181. The next prime is 1686681577223. The reversal of 1686681577218 is 8127751866861.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

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, 66887346 + ... + 66912557.

It is an arithmetic number, because the mean of its divisors is an integer number (115603117056).

Almost surely, 2^{1686681577218} is an apocalyptic number.

1686681577218 is an abundant number, since it is smaller than the sum of its proper divisors (2012618168574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686681577218 is a wasteful number, since it uses less digits than its factorization.

1686681577218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133800110.

The product of its digits is 54190080, while the sum is 66.

The spelling of 1686681577218 in words is "one trillion, six hundred eighty-six billion, six hundred eighty-one million, five hundred seventy-seven thousand, two hundred eighteen".