66075073 has 4 divisors (see below), whose sum is σ = 69961860. Its totient is φ = 62188288.

The previous prime is 66075071. The next prime is 66075077. The reversal of 66075073 is 37057066.

66075073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37057066 = 2 ⋅18528533.

It can be written as a sum of positive squares in 2 ways, for example, as 28227969 + 37847104 = 5313^2 + 6152^2 .

It is a cyclic number.

It is not a de Polignac number, because 66075073 - 2¹ = 66075071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66075071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943368 + ... + 1943401.

It is an arithmetic number, because the mean of its divisors is an integer number (17490465).

Almost surely, 2^66075073 is an apocalyptic number.

It is an amenable number.

66075073 is a deficient number, since it is larger than the sum of its proper divisors (3886787).

66075073 is a wasteful number, since it uses less digits than its factorization.

66075073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886786.

The product of its (nonzero) digits is 26460, while the sum is 34.

The square root of 66075073 is about 8128.6575152358. The cubic root of 66075073 is about 404.2771702709.

The spelling of 66075073 in words is "sixty-six million, seventy-five thousand, seventy-three".