18686840559696 has 60 divisors (see below), whose sum is σ = 52708988646912. Its totient is φ = 6179900021568.

The previous prime is 18686840559691. The next prime is 18686840559701. The reversal of 18686840559696 is 69695504868681.

It is a happy number.

18686840559696 is a `hidden beast` number, since 1 + 8 + 68 + 68 + 405 + 5 + 9 + 6 + 96 = 666.

It is an interprime number because it is at equal distance from previous prime (18686840559691) and next prime (18686840559701).

It is a super-2 number, since 2×18686840559696² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686840559691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510886146 + ... + 510922721.

Almost surely, 2^{18686840559696} is an apocalyptic number.

18686840559696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18686840559696 is an abundant number, since it is smaller than the sum of its proper divisors (34022148087216).

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

18686840559696 is a wasteful number, since it uses less digits than its factorization.

18686840559696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021809008 (or 1021808999 counting only the distinct ones).

The product of its (nonzero) digits is 5374771200, while the sum is 81.

The spelling of 18686840559696 in words is "eighteen trillion, six hundred eighty-six billion, eight hundred forty million, five hundred fifty-nine thousand, six hundred ninety-six".