66510289 has 2 divisors, whose sum is σ = 66510290. Its totient is φ = 66510288.

The previous prime is 66510247. The next prime is 66510299. The reversal of 66510289 is 98201566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64641600 + 1868689 = 8040^2 + 1367^2 .

It is a cyclic number.

It is not a de Polignac number, because 66510289 - 2⁷ = 66510161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66510299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33255144 + 33255145.

It is an arithmetic number, because the mean of its divisors is an integer number (33255145).

Almost surely, 2^66510289 is an apocalyptic number.

It is an amenable number.

66510289 is a deficient number, since it is larger than the sum of its proper divisors (1).

66510289 is an equidigital number, since it uses as much as digits as its factorization.

66510289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 66510289 is about 8155.3840498164. The cubic root of 66510289 is about 405.1628446392.

The spelling of 66510289 in words is "sixty-six million, five hundred ten thousand, two hundred eighty-nine".