8591665985 has 16 divisors (see below), whose sum is σ = 12295155456. Its totient is φ = 5635278528.

The previous prime is 8591665981. The next prime is 8591665987. The reversal of 8591665985 is 5895661958.

It is a cyclic number.

It is not a de Polignac number, because 8591665985 - 2² = 8591665981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8591665981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5335634 + ... + 5337243.

It is an arithmetic number, because the mean of its divisors is an integer number (768447216).

Almost surely, 2^8591665985 is an apocalyptic number.

It is an amenable number.

8591665985 is a deficient number, since it is larger than the sum of its proper divisors (3703489471).

8591665985 is a wasteful number, since it uses less digits than its factorization.

8591665985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10672912.

The product of its digits is 23328000, while the sum is 62.

The square root of 8591665985 is about 92691.2400661465. The cubic root of 8591665985 is about 2048.1375895092.

The spelling of 8591665985 in words is "eight billion, five hundred ninety-one million, six hundred sixty-five thousand, nine hundred eighty-five".