65560399 has 2 divisors, whose sum is σ = 65560400. Its totient is φ = 65560398.

The previous prime is 65560379. The next prime is 65560409. The reversal of 65560399 is 99306556.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65560399 - 2⁵ = 65560367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65560309) 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, 32780199 + 32780200.

It is an arithmetic number, because the mean of its divisors is an integer number (32780200).

Almost surely, 2^65560399 is an apocalyptic number.

65560399 is a deficient number, since it is larger than the sum of its proper divisors (1).

65560399 is an equidigital number, since it uses as much as digits as its factorization.

65560399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 65560399 is about 8096.9376309812. The cubic root of 65560399 is about 403.2247636349.

The spelling of 65560399 in words is "sixty-five million, five hundred sixty thousand, three hundred ninety-nine".