18786508013 has 16 divisors (see below), whose sum is σ = 23231462016. Its totient is φ = 14793589440.

The previous prime is 18786508007. The next prime is 18786508043. The reversal of 18786508013 is 31080568781.

It is a happy number.

It is not a de Polignac number, because 18786508013 - 2¹² = 18786503917 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18786508003) 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, 470006 + ... + 508407.

It is an arithmetic number, because the mean of its divisors is an integer number (1451966376).

Almost surely, 2^18786508013 is an apocalyptic number.

18786508013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18786508013 is a deficient number, since it is larger than the sum of its proper divisors (4444954003).

18786508013 is a wasteful number, since it uses less digits than its factorization.

18786508013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978644.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 18786508013 in words is "eighteen billion, seven hundred eighty-six million, five hundred eight thousand, thirteen".