66804041 has 2 divisors, whose sum is σ = 66804042. Its totient is φ = 66804040.

The previous prime is 66804037. The next prime is 66804043. The reversal of 66804041 is 14040866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40589641 + 26214400 = 6371^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 66804041 - 2² = 66804037 is a prime.

Together with 66804043, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66803995 and 66804013.

It is not a weakly prime, because it can be changed into another prime (66804043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33402020 + 33402021.

It is an arithmetic number, because the mean of its divisors is an integer number (33402021).

Almost surely, 2^66804041 is an apocalyptic number.

It is an amenable number.

66804041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66804041 is an equidigital number, since it uses as much as digits as its factorization.

66804041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 66804041 is about 8173.3739055545. The cubic root of 66804041 is about 405.7584547691.

The spelling of 66804041 in words is "sixty-six million, eight hundred four thousand, forty-one".