18500479871 has 8 divisors (see below), whose sum is σ = 18585372624. Its totient is φ = 18415687680.

The previous prime is 18500479843. The next prime is 18500479883. The reversal of 18500479871 is 17897400581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18500479871 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 (18500479171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356861 + ... + 405401.

It is an arithmetic number, because the mean of its divisors is an integer number (2323171578).

Almost surely, 2^18500479871 is an apocalyptic number.

18500479871 is a deficient number, since it is larger than the sum of its proper divisors (84892753).

18500479871 is a wasteful number, since it uses less digits than its factorization.

18500479871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50281.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 18500479871 in words is "eighteen billion, five hundred million, four hundred seventy-nine thousand, eight hundred seventy-one".