18481281008 has 40 divisors (see below), whose sum is σ = 37059212880. Its totient is φ = 8917905920.

The previous prime is 18481280999. The next prime is 18481281023. The reversal of 18481281008 is 80018218481.

It is a super-2 number, since 2×18481281008² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166516 + ... + 1182252.

It is an arithmetic number, because the mean of its divisors is an integer number (926480322).

Almost surely, 2^18481281008 is an apocalyptic number.

It is an amenable number.

18481281008 is an abundant number, since it is smaller than the sum of its proper divisors (18577931872).

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

18481281008 is a wasteful number, since it uses less digits than its factorization.

18481281008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18305 (or 18299 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 41.

Adding to 18481281008 its reverse (80018218481), we get a palindrome (98499499489).

The spelling of 18481281008 in words is "eighteen billion, four hundred eighty-one million, two hundred eighty-one thousand, eight".