27495638197 has 2 divisors, whose sum is σ = 27495638198. Its totient is φ = 27495638196.

The previous prime is 27495638081. The next prime is 27495638249. The reversal of 27495638197 is 79183659472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22208748676 + 5286889521 = 149026^2 + 72711^2 .

It is a cyclic number.

It is not a de Polignac number, because 27495638197 - 2⁷ = 27495638069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27495638497) 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, 13747819098 + 13747819099.

It is an arithmetic number, because the mean of its divisors is an integer number (13747819099).

Almost surely, 2^27495638197 is an apocalyptic number.

It is an amenable number.

27495638197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27495638197 is an equidigital number, since it uses as much as digits as its factorization.

27495638197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 61.

The spelling of 27495638197 in words is "twenty-seven billion, four hundred ninety-five million, six hundred thirty-eight thousand, one hundred ninety-seven".