18085677289 has 9 divisors (see below), whose sum is σ = 18210659799. Its totient is φ = 17961549480.

The previous prime is 18085677287. The next prime is 18085677299. The reversal of 18085677289 is 98277658081.

The square root of 18085677289 is 134483.

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

It can be written as a sum of positive squares in only one way, i.e., 199289689 + 17886387600 = 14117^2 + 133740^2 .

It is not a de Polignac number, because 18085677289 - 2¹ = 18085677287 is a prime.

It is a super-3 number, since 3×18085677289³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18085677287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24341052 + ... + 24341794.

Almost surely, 2^18085677289 is an apocalyptic number.

18085677289 is the 134483-rd square number.

18085677289 is the 67242-nd centered octagonal number.

It is an amenable number.

18085677289 is a deficient number, since it is larger than the sum of its proper divisors (124982510).

18085677289 is an frugal number, since it uses more digits than its factorization.

18085677289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 18085677289 in words is "eighteen billion, eighty-five million, six hundred seventy-seven thousand, two hundred eighty-nine".