18316681531686 has 12 divisors (see below), whose sum is σ = 39686143318692. Its totient is φ = 6105560510556.

The previous prime is 18316681531667. The next prime is 18316681531747. The reversal of 18316681531686 is 68613518661381.

It is a happy number.

18316681531686 is a `hidden beast` number, since 1 + 8 + 3 + 16 + 6 + 8 + 1 + 531 + 6 + 86 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 508796709196 + ... + 508796709231.

It is an arithmetic number, because the mean of its divisors is an integer number (3307178609891).

Almost surely, 2^{18316681531686} is an apocalyptic number.

18316681531686 is an abundant number, since it is smaller than the sum of its proper divisors (21369461787006).

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

18316681531686 is a wasteful number, since it uses less digits than its factorization.

18316681531686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017593418435 (or 1017593418432 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 18316681531686 in words is "eighteen trillion, three hundred sixteen billion, six hundred eighty-one million, five hundred thirty-one thousand, six hundred eighty-six".