18678537687 has 16 divisors (see below), whose sum is σ = 26373403872. Its totient is φ = 11718220800.

The previous prime is 18678537673. The next prime is 18678537697. The reversal of 18678537687 is 78673587681.

It is a happy number.

It is not a de Polignac number, because 18678537687 - 2¹⁶ = 18678472151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678537697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413937 + ... + 456837.

It is an arithmetic number, because the mean of its divisors is an integer number (1648337742).

Almost surely, 2^18678537687 is an apocalyptic number.

18678537687 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18678537687 is a deficient number, since it is larger than the sum of its proper divisors (7694866185).

18678537687 is a wasteful number, since it uses less digits than its factorization.

18678537687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51458.

The product of its digits is 94832640, while the sum is 66.

The spelling of 18678537687 in words is "eighteen billion, six hundred seventy-eight million, five hundred thirty-seven thousand, six hundred eighty-seven".