65216399 has 2 divisors, whose sum is σ = 65216400. Its totient is φ = 65216398.

The previous prime is 65216357. The next prime is 65216413. The reversal of 65216399 is 99361256.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65216399 - 2¹⁶ = 65150863 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65216699) 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, 32608199 + 32608200.

It is an arithmetic number, because the mean of its divisors is an integer number (32608200).

Almost surely, 2^65216399 is an apocalyptic number.

65216399 is a deficient number, since it is larger than the sum of its proper divisors (1).

65216399 is an equidigital number, since it uses as much as digits as its factorization.

65216399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 41.

The square root of 65216399 is about 8075.6670931880. The cubic root of 65216399 is about 402.5182770143.

The spelling of 65216399 in words is "sixty-five million, two hundred sixteen thousand, three hundred ninety-nine".