18130166209 has 4 divisors (see below), whose sum is σ = 18131502420. Its totient is φ = 18128830000.

The previous prime is 18130166203. The next prime is 18130166213. The reversal of 18130166209 is 90266103181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17484243984 + 645922225 = 132228^2 + 25415^2 .

It is a cyclic number.

It is not a de Polignac number, because 18130166209 - 2⁵ = 18130166177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18130166203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647542 + ... + 674959.

It is an arithmetic number, because the mean of its divisors is an integer number (4532875605).

Almost surely, 2^18130166209 is an apocalyptic number.

It is an amenable number.

18130166209 is a deficient number, since it is larger than the sum of its proper divisors (1336211).

18130166209 is a wasteful number, since it uses less digits than its factorization.

18130166209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336210.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 18130166209 in words is "eighteen billion, one hundred thirty million, one hundred sixty-six thousand, two hundred nine".