65355330221 has 2 divisors, whose sum is σ = 65355330222. Its totient is φ = 65355330220.

The previous prime is 65355330203. The next prime is 65355330251. The reversal of 65355330221 is 12203355356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64954129321 + 401200900 = 254861^2 + 20030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65355330221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65355330251) 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, 32677665110 + 32677665111.

It is an arithmetic number, because the mean of its divisors is an integer number (32677665111).

Almost surely, 2^65355330221 is an apocalyptic number.

It is an amenable number.

65355330221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65355330221 is an equidigital number, since it uses as much as digits as its factorization.

65355330221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 35.

Adding to 65355330221 its reverse (12203355356), we get a palindrome (77558685577).

The spelling of 65355330221 in words is "sixty-five billion, three hundred fifty-five million, three hundred thirty thousand, two hundred twenty-one".