18418405533 has 8 divisors (see below), whose sum is σ = 26790408096. Its totient is φ = 11162670000.

The previous prime is 18418405531. The next prime is 18418405567. The reversal of 18418405533 is 33550481481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18418405533 - 2¹ = 18418405531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418405531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279066718 + ... + 279066783.

It is an arithmetic number, because the mean of its divisors is an integer number (3348801012).

Almost surely, 2^18418405533 is an apocalyptic number.

It is an amenable number.

18418405533 is a deficient number, since it is larger than the sum of its proper divisors (8372002563).

18418405533 is a wasteful number, since it uses less digits than its factorization.

18418405533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558133515.

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 18418405533 in words is "eighteen billion, four hundred eighteen million, four hundred five thousand, five hundred thirty-three".