18484578216 has 128 divisors (see below), whose sum is σ = 56582064000. Its totient is φ = 5555257344.

The previous prime is 18484578197. The next prime is 18484578263. The reversal of 18484578216 is 61287548481.

18484578216 is a `hidden beast` number, since 1 + 8 + 48 + 4 + 578 + 21 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44200 + ... + 197288.

It is an arithmetic number, because the mean of its divisors is an integer number (442047375).

Almost surely, 2^18484578216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18484578216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28291032000).

18484578216 is an abundant number, since it is smaller than the sum of its proper divisors (38097485784).

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

18484578216 is a wasteful number, since it uses less digits than its factorization.

18484578216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153160 (or 153150 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The spelling of 18484578216 in words is "eighteen billion, four hundred eighty-four million, five hundred seventy-eight thousand, two hundred sixteen".