27720783569 has 2 divisors, whose sum is σ = 27720783570. Its totient is φ = 27720783568.

The previous prime is 27720783521. The next prime is 27720783583. The reversal of 27720783569 is 96538702772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22383750544 + 5337033025 = 149612^2 + 73055^2 .

It is a cyclic number.

It is not a de Polignac number, because 27720783569 - 2⁸ = 27720783313 is a prime.

It is a super-2 number, since 2×27720783569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27720783509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860391784 + 13860391785.

It is an arithmetic number, because the mean of its divisors is an integer number (13860391785).

Almost surely, 2^27720783569 is an apocalyptic number.

It is an amenable number.

27720783569 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720783569 is an equidigital number, since it uses as much as digits as its factorization.

27720783569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 27720783569 in words is "twenty-seven billion, seven hundred twenty million, seven hundred eighty-three thousand, five hundred sixty-nine".