66511241 has 2 divisors, whose sum is σ = 66511242. Its totient is φ = 66511240.

The previous prime is 66511219. The next prime is 66511253. The reversal of 66511241 is 14211566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 495616 = 8125^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 66511241 - 2⁶ = 66511177 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66511241.

It is not a weakly prime, because it can be changed into another prime (66511261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33255620 + 33255621.

It is an arithmetic number, because the mean of its divisors is an integer number (33255621).

Almost surely, 2^66511241 is an apocalyptic number.

It is an amenable number.

66511241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66511241 is an equidigital number, since it uses as much as digits as its factorization.

66511241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 66511241 is about 8155.4424159576. The cubic root of 66511241 is about 405.1647777396.

The spelling of 66511241 in words is "sixty-six million, five hundred eleven thousand, two hundred forty-one".