66723941 has 2 divisors, whose sum is σ = 66723942. Its totient is φ = 66723940.

The previous prime is 66723911. The next prime is 66723947. The reversal of 66723941 is 14932766.

66723941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56776225 + 9947716 = 7535^2 + 3154^2 .

It is a cyclic number.

It is not a de Polignac number, because 66723941 - 2¹⁰ = 66722917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66723895 and 66723904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66723947) 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 as a sum of consecutive naturals, namely, 33361970 + 33361971.

It is an arithmetic number, because the mean of its divisors is an integer number (33361971).

Almost surely, 2^66723941 is an apocalyptic number.

It is an amenable number.

66723941 is a deficient number, since it is larger than the sum of its proper divisors (1).

66723941 is an equidigital number, since it uses as much as digits as its factorization.

66723941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 66723941 is about 8168.4723786030. The cubic root of 66723941 is about 405.5962178227.

The spelling of 66723941 in words is "sixty-six million, seven hundred twenty-three thousand, nine hundred forty-one".