27766339434221 has 2 divisors, whose sum is σ = 27766339434222. Its totient is φ = 27766339434220.

The previous prime is 27766339434203. The next prime is 27766339434227. The reversal of 27766339434221 is 12243493366772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26346262045321 + 1420077388900 = 5132861^2 + 1191670^2 .

It is a cyclic number.

It is not a de Polignac number, because 27766339434221 - 2³⁴ = 27749159565037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27766339434227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13883169717110 + 13883169717111.

It is an arithmetic number, because the mean of its divisors is an integer number (13883169717111).

Almost surely, 2^{27766339434221} is an apocalyptic number.

It is an amenable number.

27766339434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27766339434221 is an equidigital number, since it uses as much as digits as its factorization.

27766339434221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 59.

The spelling of 27766339434221 in words is "twenty-seven trillion, seven hundred sixty-six billion, three hundred thirty-nine million, four hundred thirty-four thousand, two hundred twenty-one".