18646004505 has 16 divisors (see below), whose sum is σ = 30322684224. Its totient is φ = 9781510080.

The previous prime is 18646004501. The next prime is 18646004539. The reversal of 18646004505 is 50540064681.

It is a happy number.

It is not a de Polignac number, because 18646004505 - 2² = 18646004501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18646004501) 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, 10188159 + ... + 10189988.

It is an arithmetic number, because the mean of its divisors is an integer number (1895167764).

Almost surely, 2^18646004505 is an apocalyptic number.

18646004505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18646004505 is a deficient number, since it is larger than the sum of its proper divisors (11676679719).

18646004505 is a wasteful number, since it uses less digits than its factorization.

18646004505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20378216.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 18646004505 in words is "eighteen billion, six hundred forty-six million, four thousand, five hundred five".