18684404509 has 8 divisors (see below), whose sum is σ = 19674331040. Its totient is φ = 17695131696.

The previous prime is 18684404429. The next prime is 18684404533. The reversal of 18684404509 is 90540448681.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18684404509 - 2³¹ = 16536920861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18684404539) 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, 104199 + ... + 219604.

It is an arithmetic number, because the mean of its divisors is an integer number (2459291380).

Almost surely, 2^18684404509 is an apocalyptic number.

18684404509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18684404509 is a deficient number, since it is larger than the sum of its proper divisors (989926531).

18684404509 is a wasteful number, since it uses less digits than its factorization.

18684404509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326859.

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 18684404509 in words is "eighteen billion, six hundred eighty-four million, four hundred four thousand, five hundred nine".