66306269 has 2 divisors, whose sum is σ = 66306270. Its totient is φ = 66306268.

The previous prime is 66306259. The next prime is 66306271. The reversal of 66306269 is 96260366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 13235044 = 7285^2 + 3638^2 .

It is a cyclic number.

It is not a de Polignac number, because 66306269 - 2⁸ = 66306013 is a prime.

It is a super-2 number, since 2×66306269² = 8793042617400722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 66306271, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66306259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33153134 + 33153135.

It is an arithmetic number, because the mean of its divisors is an integer number (33153135).

Almost surely, 2^66306269 is an apocalyptic number.

It is an amenable number.

66306269 is a deficient number, since it is larger than the sum of its proper divisors (1).

66306269 is an equidigital number, since it uses as much as digits as its factorization.

66306269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 66306269 is about 8142.8661415990. The cubic root of 66306269 is about 404.7481419408.

The spelling of 66306269 in words is "sixty-six million, three hundred six thousand, two hundred sixty-nine".