18135411804 has 72 divisors (see below), whose sum is σ = 47349399552. Its totient is φ = 5846631840.

The previous prime is 18135411803. The next prime is 18135411829. The reversal of 18135411804 is 40811453181.

It is a super-2 number, since 2×18135411804² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18135411803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2387797 + ... + 2395379.

Almost surely, 2^18135411804 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 18135411804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23674699776).

18135411804 is an abundant number, since it is smaller than the sum of its proper divisors (29213987748).

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

18135411804 is a wasteful number, since it uses less digits than its factorization.

18135411804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9767 (or 9762 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

Adding to 18135411804 its reverse (40811453181), we get a palindrome (58946864985).

The spelling of 18135411804 in words is "eighteen billion, one hundred thirty-five million, four hundred eleven thousand, eight hundred four".