18686463687 has 24 divisors (see below), whose sum is σ = 27679011360. Its totient is φ = 12140997120.

The previous prime is 18686463673. The next prime is 18686463709. The reversal of 18686463687 is 78636468681.

18686463687 is a `hidden beast` number, since 18 + 6 + 86 + 463 + 6 + 87 = 666.

It is not a de Polignac number, because 18686463687 - 2⁴ = 18686463671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686463667) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 330639 + ... + 383007.

It is an arithmetic number, because the mean of its divisors is an integer number (1153292140).

Almost surely, 2^18686463687 is an apocalyptic number.

18686463687 is a deficient number, since it is larger than the sum of its proper divisors (8992547673).

18686463687 is a wasteful number, since it uses less digits than its factorization.

18686463687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53383 (or 53380 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 63.

The spelling of 18686463687 in words is "eighteen billion, six hundred eighty-six million, four hundred sixty-three thousand, six hundred eighty-seven".