18671861984 has 12 divisors (see below), whose sum is σ = 36760228344. Its totient is φ = 9335930976.

The previous prime is 18671861953. The next prime is 18671861993. The reversal of 18671861984 is 48916817681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291747812 + ... + 291747875.

It is an arithmetic number, because the mean of its divisors is an integer number (3063352362).

Almost surely, 2^18671861984 is an apocalyptic number.

It is an amenable number.

18671861984 is a deficient number, since it is larger than the sum of its proper divisors (18088366360).

18671861984 is an equidigital number, since it uses as much as digits as its factorization.

18671861984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583495697 (or 583495689 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 59.

The spelling of 18671861984 in words is "eighteen billion, six hundred seventy-one million, eight hundred sixty-one thousand, nine hundred eighty-four".