18666880109 has 16 divisors (see below), whose sum is σ = 20157811200. Its totient is φ = 17233028736.

The previous prime is 18666880103. The next prime is 18666880153. The reversal of 18666880109 is 90108866681.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18666880109 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 (18666880103) 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, 3194012 + ... + 3199850.

It is an arithmetic number, because the mean of its divisors is an integer number (1259863200).

Almost surely, 2^18666880109 is an apocalyptic number.

It is an amenable number.

18666880109 is a deficient number, since it is larger than the sum of its proper divisors (1490931091).

18666880109 is a wasteful number, since it uses less digits than its factorization.

18666880109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684.

The product of its (nonzero) digits is 995328, while the sum is 53.

The spelling of 18666880109 in words is "eighteen billion, six hundred sixty-six million, eight hundred eighty thousand, one hundred nine".