18009208466 has 4 divisors (see below), whose sum is σ = 27013812702. Its totient is φ = 9004604232.

The previous prime is 18009208453. The next prime is 18009208493. The reversal of 18009208466 is 66480290081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12885655225 + 5123553241 = 113515^2 + 71579^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4502302115 + ... + 4502302118.

Almost surely, 2^18009208466 is an apocalyptic number.

18009208466 is a deficient number, since it is larger than the sum of its proper divisors (9004604236).

18009208466 is an equidigital number, since it uses as much as digits as its factorization.

18009208466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004604235.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 18009208466 in words is "eighteen billion, nine million, two hundred eight thousand, four hundred sixty-six".