18857889989 has 8 divisors (see below), whose sum is σ = 19058923968. Its totient is φ = 18656991360.

The previous prime is 18857889977. The next prime is 18857890019. The reversal of 18857889989 is 98998875881.

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 18857889989 - 2²⁰ = 18856841413 is a prime.

It is a Duffinian 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 (18857889929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259784 + ... + 324350.

It is an arithmetic number, because the mean of its divisors is an integer number (2382365496).

Almost surely, 2^18857889989 is an apocalyptic number.

It is an amenable number.

18857889989 is a deficient number, since it is larger than the sum of its proper divisors (201033979).

18857889989 is an equidigital number, since it uses as much as digits as its factorization.

18857889989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67675.

The product of its digits is 836075520, while the sum is 80.

The spelling of 18857889989 in words is "eighteen billion, eight hundred fifty-seven million, eight hundred eighty-nine thousand, nine hundred eighty-nine".