65617789 has 2 divisors, whose sum is σ = 65617790. Its totient is φ = 65617788.

The previous prime is 65617759. The next prime is 65617801. The reversal of 65617789 is 98771656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 412164 = 8075^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 65617789 - 2¹⁵ = 65585021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65617709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32808894 + 32808895.

It is an arithmetic number, because the mean of its divisors is an integer number (32808895).

Almost surely, 2^65617789 is an apocalyptic number.

It is an amenable number.

65617789 is a deficient number, since it is larger than the sum of its proper divisors (1).

65617789 is an equidigital number, since it uses as much as digits as its factorization.

65617789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 65617789 is about 8100.4807882002. The cubic root of 65617789 is about 403.3423870806.

The spelling of 65617789 in words is "sixty-five million, six hundred seventeen thousand, seven hundred eighty-nine".