18685351686 has 8 divisors (see below), whose sum is σ = 37370703384. Its totient is φ = 6228450560.

The previous prime is 18685351679. The next prime is 18685351693. The reversal of 18685351686 is 68615358681.

It is an interprime number because it is at equal distance from previous prime (18685351679) and next prime (18685351693).

It is a sphenic number, since it is the product of 3 distinct primes.

18685351686 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1557112635 + ... + 1557112646.

It is an arithmetic number, because the mean of its divisors is an integer number (4671337923).

Almost surely, 2^18685351686 is an apocalyptic number.

18685351686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18685351686 is a wasteful number, since it uses less digits than its factorization.

18685351686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114225286.

The product of its digits is 8294400, while the sum is 57.

The spelling of 18685351686 in words is "eighteen billion, six hundred eighty-five million, three hundred fifty-one thousand, six hundred eighty-six".