65664041 has 2 divisors, whose sum is σ = 65664042. Its totient is φ = 65664040.

The previous prime is 65664037. The next prime is 65664043. The reversal of 65664041 is 14046656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49632025 + 16032016 = 7045^2 + 4004^2 .

It is a cyclic number.

It is not a de Polignac number, because 65664041 - 2² = 65664037 is a prime.

It is a Sophie Germain prime.

Together with 65664043, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65663989 and 65664007.

It is not a weakly prime, because it can be changed into another prime (65664043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32832020 + 32832021.

It is an arithmetic number, because the mean of its divisors is an integer number (32832021).

Almost surely, 2^65664041 is an apocalyptic number.

It is an amenable number.

65664041 is a deficient number, since it is larger than the sum of its proper divisors (1).

65664041 is an equidigital number, since it uses as much as digits as its factorization.

65664041 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 65664041 is about 8103.3351775673. The cubic root of 65664041 is about 403.4371327833.

The spelling of 65664041 in words is "sixty-five million, six hundred sixty-four thousand, forty-one".