18686175889 has 8 divisors (see below), whose sum is σ = 19786562280. Its totient is φ = 17585922816.

The previous prime is 18686175887. The next prime is 18686175899. The reversal of 18686175889 is 98857168681.

It can be written as a sum of positive squares in 4 ways, for example, as 7598085889 + 11088090000 = 87167^2 + 105300^2 .

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

It is not a de Polignac number, because 18686175889 - 2¹ = 18686175887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18686175881) 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, 491487 + ... + 528139.

It is an arithmetic number, because the mean of its divisors is an integer number (2473320285).

Almost surely, 2^18686175889 is an apocalyptic number.

It is an amenable number.

18686175889 is a deficient number, since it is larger than the sum of its proper divisors (1100386391).

18686175889 is a wasteful number, since it uses less digits than its factorization.

18686175889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66659.

The product of its digits is 46448640, while the sum is 67.

The spelling of 18686175889 in words is "eighteen billion, six hundred eighty-six million, one hundred seventy-five thousand, eight hundred eighty-nine".