18550719189 has 6 divisors (see below), whose sum is σ = 26795483286. Its totient is φ = 12367146120.

The previous prime is 18550719167. The next prime is 18550719221. The reversal of 18550719189 is 98191705581.

It is a happy number.

18550719189 is a `hidden beast` number, since 1 + 8 + 550 + 7 + 1 + 9 + 1 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10861183089 + 7689536100 = 104217^2 + 87690^2 .

It is not a de Polignac number, because 18550719189 - 2²⁴ = 18533941973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18550712189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030595502 + ... + 1030595519.

It is an arithmetic number, because the mean of its divisors is an integer number (4465913881).

Almost surely, 2^18550719189 is an apocalyptic number.

It is an amenable number.

18550719189 is a deficient number, since it is larger than the sum of its proper divisors (8244764097).

18550719189 is a wasteful number, since it uses less digits than its factorization.

18550719189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061191027 (or 2061191024 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 54.

The spelling of 18550719189 in words is "eighteen billion, five hundred fifty million, seven hundred nineteen thousand, one hundred eighty-nine".