65968909 has 2 divisors, whose sum is σ = 65968910. Its totient is φ = 65968908.

The previous prime is 65968907. The next prime is 65968913. The reversal of 65968909 is 90986956.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 2025 = 8122^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 65968909 - 2¹ = 65968907 is a prime.

Together with 65968907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65968907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32984454 + 32984455.

It is an arithmetic number, because the mean of its divisors is an integer number (32984455).

Almost surely, 2^65968909 is an apocalyptic number.

It is an amenable number.

65968909 is a deficient number, since it is larger than the sum of its proper divisors (1).

65968909 is an equidigital number, since it uses as much as digits as its factorization.

65968909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 65968909 is about 8122.1246604568. The cubic root of 65968909 is about 404.0605344217.

The spelling of 65968909 in words is "sixty-five million, nine hundred sixty-eight thousand, nine hundred nine".