27318564065021 has 2 divisors, whose sum is σ = 27318564065022. Its totient is φ = 27318564065020.

The previous prime is 27318564065003. The next prime is 27318564065033. The reversal of 27318564065021 is 12056046581372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23915963256025 + 3402600808996 = 4890395^2 + 1844614^2 .

It is a cyclic number.

It is not a de Polignac number, because 27318564065021 - 2¹⁸ = 27318563802877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27318564055021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13659282032510 + 13659282032511.

It is an arithmetic number, because the mean of its divisors is an integer number (13659282032511).

Almost surely, 2^{27318564065021} is an apocalyptic number.

It is an amenable number.

27318564065021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27318564065021 is an equidigital number, since it uses as much as digits as its factorization.

27318564065021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 27318564065021 in words is "twenty-seven trillion, three hundred eighteen billion, five hundred sixty-four million, sixty-five thousand, twenty-one".