18281279808 has 168 divisors, whose sum is σ = 57239245440. Its totient is φ = 5532456960.

The previous prime is 18281279743. The next prime is 18281279831. The reversal of 18281279808 is 80897218281.

18281279808 is a `hidden beast` number, since 18 + 281 + 279 + 80 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6581716 + ... + 6584492.

Almost surely, 2^18281279808 is an apocalyptic number.

18281279808 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 18281279808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28619622720).

18281279808 is an abundant number, since it is smaller than the sum of its proper divisors (38957965632).

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

18281279808 is a wasteful number, since it uses less digits than its factorization.

18281279808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845 (or 3832 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 54.

The spelling of 18281279808 in words is "eighteen billion, two hundred eighty-one million, two hundred seventy-nine thousand, eight hundred eight".