18040425018 has 32 divisors (see below), whose sum is σ = 44983918080. Its totient is φ = 4685824560.

The previous prime is 18040424933. The next prime is 18040425019. The reversal of 18040425018 is 81052404081.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 18040425018.

It is not an unprimeable number, because it can be changed into a prime (18040425019) 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, 19523808 + ... + 19524731.

It is an arithmetic number, because the mean of its divisors is an integer number (1405747440).

Almost surely, 2^18040425018 is an apocalyptic number.

18040425018 is an abundant number, since it is smaller than the sum of its proper divisors (26943493062).

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

18040425018 is a wasteful number, since it uses less digits than its factorization.

18040425018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39048562.

The product of its (nonzero) digits is 10240, while the sum is 33.

Adding to 18040425018 its reverse (81052404081), we get a palindrome (99092829099).

The spelling of 18040425018 in words is "eighteen billion, forty million, four hundred twenty-five thousand, eighteen".