27764456689 has 2 divisors, whose sum is σ = 27764456690. Its totient is φ = 27764456688.

The previous prime is 27764456659. The next prime is 27764456723. The reversal of 27764456689 is 98665446772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27363776400 + 400680289 = 165420^2 + 20017^2 .

It is a cyclic number.

It is not a de Polignac number, because 27764456689 - 2¹⁹ = 27763932401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27764456689.

It is not a weakly prime, because it can be changed into another prime (27764456609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13882228344 + 13882228345.

It is an arithmetic number, because the mean of its divisors is an integer number (13882228345).

Almost surely, 2^27764456689 is an apocalyptic number.

It is an amenable number.

27764456689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27764456689 is an equidigital number, since it uses as much as digits as its factorization.

27764456689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 64.

The spelling of 27764456689 in words is "twenty-seven billion, seven hundred sixty-four million, four hundred fifty-six thousand, six hundred eighty-nine".