66145073 has 2 divisors, whose sum is σ = 66145074. Its totient is φ = 66145072.

The previous prime is 66145063. The next prime is 66145117. The reversal of 66145073 is 37054166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 8567329 = 7588^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 66145073 - 2⁸ = 66144817 is a prime.

It is not a weakly prime, because it can be changed into another prime (66145063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072536 + 33072537.

It is an arithmetic number, because the mean of its divisors is an integer number (33072537).

Almost surely, 2^66145073 is an apocalyptic number.

It is an amenable number.

66145073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66145073 is an equidigital number, since it uses as much as digits as its factorization.

66145073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66145073 is about 8132.9621295073. The cubic root of 66145073 is about 404.4198837685.

The spelling of 66145073 in words is "sixty-six million, one hundred forty-five thousand, seventy-three".