66505546073 has 2 divisors, whose sum is σ = 66505546074. Its totient is φ = 66505546072.

The previous prime is 66505546057. The next prime is 66505546117. The reversal of 66505546073 is 37064550566.

66505546073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56564060224 + 9941485849 = 237832^2 + 99707^2 .

It is a cyclic number.

It is not a de Polignac number, because 66505546073 - 2⁴ = 66505546057 is a prime.

It is not a weakly prime, because it can be changed into another prime (66505546573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33252773036 + 33252773037.

It is an arithmetic number, because the mean of its divisors is an integer number (33252773037).

Almost surely, 2^66505546073 is an apocalyptic number.

It is an amenable number.

66505546073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66505546073 is an equidigital number, since it uses as much as digits as its factorization.

66505546073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 47.

The spelling of 66505546073 in words is "sixty-six billion, five hundred five million, five hundred forty-six thousand, seventy-three".