18287423361 has 9 divisors (see below), whose sum is σ = 26415753091. Its totient is φ = 12191345112.

The previous prime is 18287423351. The next prime is 18287423387. The reversal of 18287423361 is 16332478281.

The square root of 18287423361 is 135231.

It is a perfect power (a square), and thus also a powerful number.

18287423361 is a `hidden beast` number, since 1 + 8 + 287 + 4 + 2 + 3 + 361 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10480640625 + 7806782736 = 102375^2 + 88356^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18287423361 - 2¹³ = 18287415169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18287423351) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 383155 + ... + 428231.

Almost surely, 2^18287423361 is an apocalyptic number.

18287423361 is the 135231-st square number.

18287423361 is the 67616-th centered octagonal number.

It is an amenable number.

18287423361 is a deficient number, since it is larger than the sum of its proper divisors (8128329730).

18287423361 is an frugal number, since it uses more digits than its factorization.

18287423361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90160 (or 45080 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 18287423361 in words is "eighteen billion, two hundred eighty-seven million, four hundred twenty-three thousand, three hundred sixty-one".