65866819 has 2 divisors, whose sum is σ = 65866820. Its totient is φ = 65866818.

The previous prime is 65866817. The next prime is 65866873. The reversal of 65866819 is 91866856.

65866819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65866819 - 2¹ = 65866817 is a prime.

It is a super-2 number, since 2×65866819² = 8676875690357522, which contains 22 as substring.

Together with 65866817, it forms a pair of twin primes.

It is equal to p_3888688 and since 65866819 and 3888688 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (65866817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32933409 + 32933410.

It is an arithmetic number, because the mean of its divisors is an integer number (32933410).

Almost surely, 2^65866819 is an apocalyptic number.

65866819 is a deficient number, since it is larger than the sum of its proper divisors (1).

65866819 is an equidigital number, since it uses as much as digits as its factorization.

65866819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 65866819 is about 8115.8375414987. The cubic root of 65866819 is about 403.8519925598.

The spelling of 65866819 in words is "sixty-five million, eight hundred sixty-six thousand, eight hundred nineteen".