66723073 has 4 divisors (see below), whose sum is σ = 66940720. Its totient is φ = 66505428.

The previous prime is 66723071. The next prime is 66723077. The reversal of 66723073 is 37032766.

It is a happy number.

66723073 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66723073 - 2¹ = 66723071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66723071) 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, 108363 + ... + 108976.

It is an arithmetic number, because the mean of its divisors is an integer number (16735180).

Almost surely, 2^66723073 is an apocalyptic number.

It is an amenable number.

66723073 is a deficient number, since it is larger than the sum of its proper divisors (217647).

66723073 is a wasteful number, since it uses less digits than its factorization.

66723073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217646.

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 66723073 is about 8168.4192473207. The cubic root of 66723073 is about 405.5944590385.

The spelling of 66723073 in words is "sixty-six million, seven hundred twenty-three thousand, seventy-three".