18218464488 has 512 divisors, whose sum is σ = 63258624000. Its totient is φ = 4743048960.

The previous prime is 18218464483. The next prime is 18218464529. The reversal of 18218464488 is 88446481281.

18218464488 is a `hidden beast` number, since 1 + 8 + 21 + 84 + 64 + 488 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18218464483) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 139072183 + ... + 139072313.

It is an arithmetic number, because the mean of its divisors is an integer number (123552000).

Almost surely, 2^18218464488 is an apocalyptic number.

18218464488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18218464488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31629312000).

18218464488 is an abundant number, since it is smaller than the sum of its proper divisors (45040159512).

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

18218464488 is a wasteful number, since it uses less digits than its factorization.

18218464488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 312 counting only the distinct ones).

The product of its digits is 3145728, while the sum is 54.

The spelling of 18218464488 in words is "eighteen billion, two hundred eighteen million, four hundred sixty-four thousand, four hundred eighty-eight".