18089658665 has 16 divisors (see below), whose sum is σ = 23398578000. Its totient is φ = 13346418432.

The previous prime is 18089658649. The next prime is 18089658683. The reversal of 18089658665 is 56685698081.

It can be written as a sum of positive squares in 8 ways, for example, as 8246637721 + 9843020944 = 90811^2 + 99212^2 .

It is a cyclic number.

It is not a de Polignac number, because 18089658665 - 2⁴ = 18089658649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18089658598 and 18089658607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53390 + ... + 197559.

It is an arithmetic number, because the mean of its divisors is an integer number (1462411125).

Almost surely, 2^18089658665 is an apocalyptic number.

It is an amenable number.

18089658665 is a deficient number, since it is larger than the sum of its proper divisors (5308919335).

18089658665 is a wasteful number, since it uses less digits than its factorization.

18089658665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252076.

The product of its (nonzero) digits is 24883200, while the sum is 62.

The spelling of 18089658665 in words is "eighteen billion, eighty-nine million, six hundred fifty-eight thousand, six hundred sixty-five".