265206634334221 has 2 divisors, whose sum is σ = 265206634334222. Its totient is φ = 265206634334220.

The previous prime is 265206634334153. The next prime is 265206634334351. The reversal of 265206634334221 is 122433436602562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265204807712100 + 1826622121 = 16285110^2 + 42739^2 .

It is a cyclic number.

It is not a de Polignac number, because 265206634334221 - 2¹⁷ = 265206634203149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265206634334021) 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, 132603317167110 + 132603317167111.

It is an arithmetic number, because the mean of its divisors is an integer number (132603317167111).

Almost surely, 2^{265206634334221} is an apocalyptic number.

It is an amenable number.

265206634334221 is a deficient number, since it is larger than the sum of its proper divisors (1).

265206634334221 is an equidigital number, since it uses as much as digits as its factorization.

265206634334221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 49.

The spelling of 265206634334221 in words is "two hundred sixty-five trillion, two hundred six billion, six hundred thirty-four million, three hundred thirty-four thousand, two hundred twenty-one".