18181817472 has 128 divisors (see below), whose sum is σ = 59440671360. Its totient is φ = 4795195392.

The previous prime is 18181817443. The next prime is 18181817477. The reversal of 18181817472 is 27471818181.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

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 (18181817477) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 225213 + ... + 295100.

It is an arithmetic number, because the mean of its divisors is an integer number (464380245).

Almost surely, 2^18181817472 is an apocalyptic number.

18181817472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18181817472 is an abundant number, since it is smaller than the sum of its proper divisors (41258853888).

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

18181817472 is a wasteful number, since it uses less digits than its factorization.

18181817472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520350 (or 520338 counting only the distinct ones).

The product of its digits is 200704, while the sum is 48.

The spelling of 18181817472 in words is "eighteen billion, one hundred eighty-one million, eight hundred seventeen thousand, four hundred seventy-two".