18813945689 has 8 divisors (see below), whose sum is σ = 23456347968. Its totient is φ = 14660217360.

The previous prime is 18813945677. The next prime is 18813945707. The reversal of 18813945689 is 98654931881.

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 18813945689 - 2⁸ = 18813945433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813945089) 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, 122168402 + ... + 122168555.

It is an arithmetic number, because the mean of its divisors is an integer number (2932043496).

Almost surely, 2^18813945689 is an apocalyptic number.

It is an amenable number.

18813945689 is a deficient number, since it is larger than the sum of its proper divisors (4642402279).

18813945689 is a wasteful number, since it uses less digits than its factorization.

18813945689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244336975.

The product of its digits is 14929920, while the sum is 62.

The spelling of 18813945689 in words is "eighteen billion, eight hundred thirteen million, nine hundred forty-five thousand, six hundred eighty-nine".