18271556484 has 12 divisors (see below), whose sum is σ = 42633631824. Its totient is φ = 6090518824.

The previous prime is 18271556449. The next prime is 18271556503. The reversal of 18271556484 is 48465517281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761314842 + ... + 761314865.

It is an arithmetic number, because the mean of its divisors is an integer number (3552802652).

Almost surely, 2^18271556484 is an apocalyptic number.

It is an amenable number.

18271556484 is an abundant number, since it is smaller than the sum of its proper divisors (24362075340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18271556484 is a wasteful number, since it uses less digits than its factorization.

18271556484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522629714 (or 1522629712 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The spelling of 18271556484 in words is "eighteen billion, two hundred seventy-one million, five hundred fifty-six thousand, four hundred eighty-four".