66000073 has 2 divisors, whose sum is σ = 66000074. Its totient is φ = 66000072.

The previous prime is 66000071. The next prime is 66000083. The reversal of 66000073 is 37000066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33315984 + 32684089 = 5772^2 + 5717^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000073 - 2¹ = 66000071 is a prime.

Together with 66000071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000036 + 33000037.

It is an arithmetic number, because the mean of its divisors is an integer number (33000037).

Almost surely, 2^66000073 is an apocalyptic number.

It is an amenable number.

66000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000073 is an equidigital number, since it uses as much as digits as its factorization.

66000073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 66000073 is about 8124.0428974741. The cubic root of 66000073 is about 404.1241510574.

The spelling of 66000073 in words is "sixty-six million, seventy-three", and thus it is an aban number and an uban number.