65378281 has 2 divisors, whose sum is σ = 65378282. Its totient is φ = 65378280.

The previous prime is 65378279. The next prime is 65378359. The reversal of 65378281 is 18287356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65351056 + 27225 = 8084^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 65378281 - 2¹ = 65378279 is a prime.

It is a super-2 number, since 2×65378281² = 8548639253029922, which contains 22 as substring.

Together with 65378279, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65378251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32689140 + 32689141.

It is an arithmetic number, because the mean of its divisors is an integer number (32689141).

Almost surely, 2^65378281 is an apocalyptic number.

It is an amenable number.

65378281 is a deficient number, since it is larger than the sum of its proper divisors (1).

65378281 is an equidigital number, since it uses as much as digits as its factorization.

65378281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 65378281 is about 8085.6837064036. The cubic root of 65378281 is about 402.8510492646.

The spelling of 65378281 in words is "sixty-five million, three hundred seventy-eight thousand, two hundred eighty-one".