27747535561 has 2 divisors, whose sum is σ = 27747535562. Its totient is φ = 27747535560.

The previous prime is 27747535553. The next prime is 27747535577. The reversal of 27747535561 is 16553574772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25211405961 + 2536129600 = 158781^2 + 50360^2 .

It is a cyclic number.

It is not a de Polignac number, because 27747535561 - 2³ = 27747535553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27747535499 and 27747535508.

It is not a weakly prime, because it can be changed into another prime (27747535591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13873767780 + 13873767781.

It is an arithmetic number, because the mean of its divisors is an integer number (13873767781).

Almost surely, 2^27747535561 is an apocalyptic number.

It is an amenable number.

27747535561 is a deficient number, since it is larger than the sum of its proper divisors (1).

27747535561 is an equidigital number, since it uses as much as digits as its factorization.

27747535561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6174000, while the sum is 52.

The spelling of 27747535561 in words is "twenty-seven billion, seven hundred forty-seven million, five hundred thirty-five thousand, five hundred sixty-one".