18591229404 has 144 divisors (see below), whose sum is σ = 54807597600. Its totient is φ = 5439329280.

The previous prime is 18591229399. The next prime is 18591229417. The reversal of 18591229404 is 40492219581.

It is a happy number.

18591229404 is a `hidden beast` number, since 18 + 5 + 9 + 1 + 229 + 404 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18591229404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 354444 + ... + 403500.

Almost surely, 2^18591229404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18591229404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27403798800).

18591229404 is an abundant number, since it is smaller than the sum of its proper divisors (36216368196).

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

18591229404 is a wasteful number, since it uses less digits than its factorization.

18591229404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49121 (or 49102 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 18591229404 in words is "eighteen billion, five hundred ninety-one million, two hundred twenty-nine thousand, four hundred four".