27765215089 has 2 divisors, whose sum is σ = 27765215090. Its totient is φ = 27765215088.

The previous prime is 27765215083. The next prime is 27765215123. The reversal of 27765215089 is 98051256772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21757725025 + 6007490064 = 147505^2 + 77508^2 .

It is a cyclic number.

It is not a de Polignac number, because 27765215089 - 2¹³ = 27765206897 is a prime.

It is not a weakly prime, because it can be changed into another prime (27765215083) 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, 13882607544 + 13882607545.

It is an arithmetic number, because the mean of its divisors is an integer number (13882607545).

Almost surely, 2^27765215089 is an apocalyptic number.

It is an amenable number.

27765215089 is a deficient number, since it is larger than the sum of its proper divisors (1).

27765215089 is an equidigital number, since it uses as much as digits as its factorization.

27765215089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 27765215089 in words is "twenty-seven billion, seven hundred sixty-five million, two hundred fifteen thousand, eighty-nine".