8665728613 has 2 divisors, whose sum is σ = 8665728614. Its totient is φ = 8665728612.

The previous prime is 8665728517. The next prime is 8665728647. The reversal of 8665728613 is 3168275668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6837139969 + 1828588644 = 82687^2 + 42762^2 .

It is a cyclic number.

It is not a de Polignac number, because 8665728613 - 2²⁵ = 8632174181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8665728683) 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 as a sum of consecutive naturals, namely, 4332864306 + 4332864307.

It is an arithmetic number, because the mean of its divisors is an integer number (4332864307).

Almost surely, 2^8665728613 is an apocalyptic number.

It is an amenable number.

8665728613 is a deficient number, since it is larger than the sum of its proper divisors (1).

8665728613 is an equidigital number, since it uses as much as digits as its factorization.

8665728613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 52.

The square root of 8665728613 is about 93089.8953324151. The cubic root of 8665728613 is about 2054.0059374480.

The spelling of 8665728613 in words is "eight billion, six hundred sixty-five million, seven hundred twenty-eight thousand, six hundred thirteen".