18789856845 has 16 divisors (see below), whose sum is σ = 30762929472. Its totient is φ = 9788204160.

The previous prime is 18789856837. The next prime is 18789856859. The reversal of 18789856845 is 54865898781.

It is not a de Polignac number, because 18789856845 - 2³ = 18789856837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18789856845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14565136 + ... + 14566425.

It is an arithmetic number, because the mean of its divisors is an integer number (1922683092).

Almost surely, 2^18789856845 is an apocalyptic number.

18789856845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18789856845 is a deficient number, since it is larger than the sum of its proper divisors (11973072627).

18789856845 is a wasteful number, since it uses less digits than its factorization.

18789856845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29131612.

The product of its digits is 154828800, while the sum is 69.

The spelling of 18789856845 in words is "eighteen billion, seven hundred eighty-nine million, eight hundred fifty-six thousand, eight hundred forty-five".