27806135641 has 2 divisors, whose sum is σ = 27806135642. Its totient is φ = 27806135640.

The previous prime is 27806135537. The next prime is 27806135647. The reversal of 27806135641 is 14653160872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15886081600 + 11920054041 = 126040^2 + 109179^2 .

It is a cyclic number.

It is not a de Polignac number, because 27806135641 - 2¹⁵ = 27806102873 is a prime.

It is not a weakly prime, because it can be changed into another prime (27806135647) 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, 13903067820 + 13903067821.

It is an arithmetic number, because the mean of its divisors is an integer number (13903067821).

Almost surely, 2^27806135641 is an apocalyptic number.

It is an amenable number.

27806135641 is a deficient number, since it is larger than the sum of its proper divisors (1).

27806135641 is an equidigital number, since it uses as much as digits as its factorization.

27806135641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 27806135641 in words is "twenty-seven billion, eight hundred six million, one hundred thirty-five thousand, six hundred forty-one".