66682289 has 2 divisors, whose sum is σ = 66682290. Its totient is φ = 66682288.

The previous prime is 66682247. The next prime is 66682307. The reversal of 66682289 is 98228666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38539264 + 28143025 = 6208^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 66682289 - 2²⁰ = 65633713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66682489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33341144 + 33341145.

It is an arithmetic number, because the mean of its divisors is an integer number (33341145).

Almost surely, 2^66682289 is an apocalyptic number.

It is an amenable number.

66682289 is a deficient number, since it is larger than the sum of its proper divisors (1).

66682289 is an equidigital number, since it uses as much as digits as its factorization.

66682289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 66682289 is about 8165.9224218700. The cubic root of 66682289 is about 405.5118032935.

The spelling of 66682289 in words is "sixty-six million, six hundred eighty-two thousand, two hundred eighty-nine".