18043443604 has 48 divisors (see below), whose sum is σ = 33227341056. Its totient is φ = 8556768000.

The previous prime is 18043443601. The next prime is 18043443617. The reversal of 18043443604 is 40634434081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043443601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12182544 + ... + 12184024.

It is an arithmetic number, because the mean of its divisors is an integer number (692236272).

Almost surely, 2^18043443604 is an apocalyptic number.

It is an amenable number.

18043443604 is a deficient number, since it is larger than the sum of its proper divisors (15183897452).

18043443604 is a wasteful number, since it uses less digits than its factorization.

18043443604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536 (or 2534 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 18043443604 its reverse (40634434081), we get a palindrome (58677877685).

The spelling of 18043443604 in words is "eighteen billion, forty-three million, four hundred forty-three thousand, six hundred four".