66288755521 has 2 divisors, whose sum is σ = 66288755522. Its totient is φ = 66288755520.

The previous prime is 66288755471. The next prime is 66288755591. The reversal of 66288755521 is 12555788266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50102554896 + 16186200625 = 223836^2 + 127225^2 .

It is a cyclic number.

It is not a de Polignac number, because 66288755521 - 2²⁷ = 66154537793 is a prime.

It is not a weakly prime, because it can be changed into another prime (66288755591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33144377760 + 33144377761.

It is an arithmetic number, because the mean of its divisors is an integer number (33144377761).

Almost surely, 2^66288755521 is an apocalyptic number.

It is an amenable number.

66288755521 is a deficient number, since it is larger than the sum of its proper divisors (1).

66288755521 is an equidigital number, since it uses as much as digits as its factorization.

66288755521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064000, while the sum is 55.

The spelling of 66288755521 in words is "sixty-six billion, two hundred eighty-eight million, seven hundred fifty-five thousand, five hundred twenty-one".