65542575221 has 2 divisors, whose sum is σ = 65542575222. Its totient is φ = 65542575220.

The previous prime is 65542575211. The next prime is 65542575233. The reversal of 65542575221 is 12257524556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61746783121 + 3795792100 = 248489^2 + 61610^2 .

It is a cyclic number.

It is not a de Polignac number, because 65542575221 - 2²² = 65538380917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65542575211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32771287610 + 32771287611.

It is an arithmetic number, because the mean of its divisors is an integer number (32771287611).

Almost surely, 2^65542575221 is an apocalyptic number.

It is an amenable number.

65542575221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65542575221 is an equidigital number, since it uses as much as digits as its factorization.

65542575221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840000, while the sum is 44.

The spelling of 65542575221 in words is "sixty-five billion, five hundred forty-two million, five hundred seventy-five thousand, two hundred twenty-one".