66645041 has 2 divisors, whose sum is σ = 66645042. Its totient is φ = 66645040.

The previous prime is 66645031. The next prime is 66645067. The reversal of 66645041 is 14054666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 970225 = 8104^2 + 985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66645041 is a prime.

It is a super-2 number, since 2×66645041² = 8883122979783362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66644989 and 66645007.

It is not a weakly prime, because it can be changed into another prime (66645031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322520 + 33322521.

It is an arithmetic number, because the mean of its divisors is an integer number (33322521).

Almost surely, 2^66645041 is an apocalyptic number.

It is an amenable number.

66645041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66645041 is an equidigital number, since it uses as much as digits as its factorization.

66645041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 66645041 is about 8163.6414056474. The cubic root of 66645041 is about 405.4362844056.

The spelling of 66645041 in words is "sixty-six million, six hundred forty-five thousand, forty-one".