18678505613 has 8 divisors (see below), whose sum is σ = 18799186560. Its totient is φ = 18557930160.

The previous prime is 18678505589. The next prime is 18678505631. The reversal of 18678505613 is 31650587681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18678505613 - 2⁸ = 18678505357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678505673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345728 + ... + 396086.

It is an arithmetic number, because the mean of its divisors is an integer number (2349898320).

Almost surely, 2^18678505613 is an apocalyptic number.

It is an amenable number.

18678505613 is a deficient number, since it is larger than the sum of its proper divisors (120680947).

18678505613 is a wasteful number, since it uses less digits than its factorization.

18678505613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52747.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 18678505613 in words is "eighteen billion, six hundred seventy-eight million, five hundred five thousand, six hundred thirteen".