66870073 has 2 divisors, whose sum is σ = 66870074. Its totient is φ = 66870072.

The previous prime is 66870059. The next prime is 66870077. The reversal of 66870073 is 37007866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59644729 + 7225344 = 7723^2 + 2688^2 .

It is a cyclic number.

It is not a de Polignac number, because 66870073 - 2¹³ = 66861881 is a prime.

It is not a weakly prime, because it can be changed into another prime (66870077) 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, 33435036 + 33435037.

It is an arithmetic number, because the mean of its divisors is an integer number (33435037).

Almost surely, 2^66870073 is an apocalyptic number.

It is an amenable number.

66870073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66870073 is an equidigital number, since it uses as much as digits as its factorization.

66870073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66870073 is about 8177.4123657793. The cubic root of 66870073 is about 405.8921004735.

The spelling of 66870073 in words is "sixty-six million, eight hundred seventy thousand, seventy-three".