65521705677161 has 2 divisors, whose sum is σ = 65521705677162. Its totient is φ = 65521705677160.

The previous prime is 65521705677157. The next prime is 65521705677193. The reversal of 65521705677161 is 16177650712556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50789496555625 + 14732209121536 = 7126675^2 + 3838256^2 .

It is a cyclic number.

It is not a de Polignac number, because 65521705677161 - 2² = 65521705677157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65521705677161.

It is not a weakly prime, because it can be changed into another prime (65521705647161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32760852838580 + 32760852838581.

It is an arithmetic number, because the mean of its divisors is an integer number (32760852838581).

Almost surely, 2^{65521705677161} is an apocalyptic number.

It is an amenable number.

65521705677161 is a deficient number, since it is larger than the sum of its proper divisors (1).

65521705677161 is an equidigital number, since it uses as much as digits as its factorization.

65521705677161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18522000, while the sum is 59.

The spelling of 65521705677161 in words is "sixty-five trillion, five hundred twenty-one billion, seven hundred five million, six hundred seventy-seven thousand, one hundred sixty-one".