65854909 has 2 divisors, whose sum is σ = 65854910. Its totient is φ = 65854908.

The previous prime is 65854907. The next prime is 65854963. The reversal of 65854909 is 90945856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34550884 + 31304025 = 5878^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 65854909 - 2¹ = 65854907 is a prime.

Together with 65854907, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65854907) 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, 32927454 + 32927455.

It is an arithmetic number, because the mean of its divisors is an integer number (32927455).

Almost surely, 2^65854909 is an apocalyptic number.

It is an amenable number.

65854909 is a deficient number, since it is larger than the sum of its proper divisors (1).

65854909 is an equidigital number, since it uses as much as digits as its factorization.

65854909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 65854909 is about 8115.1037578086. The cubic root of 65854909 is about 403.8276496649.

The spelling of 65854909 in words is "sixty-five million, eight hundred fifty-four thousand, nine hundred nine".