65456609 has 2 divisors, whose sum is σ = 65456610. Its totient is φ = 65456608.

The previous prime is 65456591. The next prime is 65456617. The reversal of 65456609 is 90665456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59830225 + 5626384 = 7735^2 + 2372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65456609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65456309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32728304 + 32728305.

It is an arithmetic number, because the mean of its divisors is an integer number (32728305).

Almost surely, 2^65456609 is an apocalyptic number.

It is an amenable number.

65456609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65456609 is an equidigital number, since it uses as much as digits as its factorization.

65456609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 65456609 is about 8090.5258790761. The cubic root of 65456609 is about 403.0118668090.

The spelling of 65456609 in words is "sixty-five million, four hundred fifty-six thousand, six hundred nine".