66043073 has 4 divisors (see below), whose sum is σ = 66785220. Its totient is φ = 65300928.

The previous prime is 66043067. The next prime is 66043091. The reversal of 66043073 is 37034066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37034066 = 2 ⋅18517033.

It can be written as a sum of positive squares in 2 ways, for example, as 4765489 + 61277584 = 2183^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 66043073 - 2⁶ = 66043009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66043013) 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 in 3 ways as a sum of consecutive naturals, for example, 370940 + ... + 371117.

It is an arithmetic number, because the mean of its divisors is an integer number (16696305).

Almost surely, 2^66043073 is an apocalyptic number.

It is an amenable number.

66043073 is a deficient number, since it is larger than the sum of its proper divisors (742147).

66043073 is an equidigital number, since it uses as much as digits as its factorization.

66043073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742146.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 66043073 is about 8126.6889321543. The cubic root of 66043073 is about 404.2118962431.

The spelling of 66043073 in words is "sixty-six million, forty-three thousand, seventy-three".