66740041 has 2 divisors, whose sum is σ = 66740042. Its totient is φ = 66740040.

The previous prime is 66740021. The next prime is 66740053. The reversal of 66740041 is 14004766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 5900041 = 7800^2 + 2429^2 .

It is a cyclic number.

It is not a de Polignac number, because 66740041 - 2⁹ = 66739529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66739991 and 66740009.

It is not a weakly prime, because it can be changed into another prime (66740021) 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 as a sum of consecutive naturals, namely, 33370020 + 33370021.

It is an arithmetic number, because the mean of its divisors is an integer number (33370021).

Almost surely, 2^66740041 is an apocalyptic number.

It is an amenable number.

66740041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66740041 is an equidigital number, since it uses as much as digits as its factorization.

66740041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 66740041 is about 8169.4578155469. The cubic root of 66740041 is about 405.6288376683.

The spelling of 66740041 in words is "sixty-six million, seven hundred forty thousand, forty-one".