65776289 has 2 divisors, whose sum is σ = 65776290. Its totient is φ = 65776288.

The previous prime is 65776273. The next prime is 65776301. The reversal of 65776289 is 98267756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 85264 = 8105^2 + 292^2 .

It is a cyclic number.

It is not a de Polignac number, because 65776289 - 2⁴ = 65776273 is a prime.

It is a super-2 number, since 2×65776289² = 8653040389223042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65776219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32888144 + 32888145.

It is an arithmetic number, because the mean of its divisors is an integer number (32888145).

Almost surely, 2^65776289 is an apocalyptic number.

It is an amenable number.

65776289 is a deficient number, since it is larger than the sum of its proper divisors (1).

65776289 is an equidigital number, since it uses as much as digits as its factorization.

65776289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 65776289 is about 8110.2582572937. The cubic root of 65776289 is about 403.6668842639. Note that the first 3 decimals are identical.

The spelling of 65776289 in words is "sixty-five million, seven hundred seventy-six thousand, two hundred eighty-nine".