18401133408 has 48 divisors (see below), whose sum is σ = 55203402240. Its totient is φ = 5257466496.

The previous prime is 18401133397. The next prime is 18401133427. The reversal of 18401133408 is 80433110481.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13690648 + ... + 13691991.

It is an arithmetic number, because the mean of its divisors is an integer number (1150070880).

Almost surely, 2^18401133408 is an apocalyptic number.

It is an amenable number.

18401133408 is an abundant number, since it is smaller than the sum of its proper divisors (36802268832).

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

18401133408 is a wasteful number, since it uses less digits than its factorization.

18401133408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27382659 (or 27382651 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

Adding to 18401133408 its reverse (80433110481), we get a palindrome (98834243889).

The spelling of 18401133408 in words is "eighteen billion, four hundred one million, one hundred thirty-three thousand, four hundred eight".