65217865 has 32 divisors (see below), whose sum is σ = 86430240. Its totient is φ = 47038464.

The previous prime is 65217847. The next prime is 65217869. The reversal of 65217865 is 56871256.

65217865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 10517049 + 54700816 = 3243^2 + 7396^2 .

It is a cyclic number.

It is not a de Polignac number, because 65217865 - 2¹⁷ = 65086793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65217869) 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 in 31 ways as a sum of consecutive naturals, for example, 279789 + ... + 280021.

It is an arithmetic number, because the mean of its divisors is an integer number (2700945).

It is a vampire number, since it can be written as 7565 ⋅ 8621 (with its own digits).

Almost surely, 2^65217865 is an apocalyptic number.

It is an amenable number.

65217865 is a deficient number, since it is larger than the sum of its proper divisors (21212375).

65217865 is a wasteful number, since it uses less digits than its factorization.

65217865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its digits is 100800, while the sum is 40.

The square root of 65217865 is about 8075.7578591733. The cubic root of 65217865 is about 402.5212930623.

The spelling of 65217865 in words is "sixty-five million, two hundred seventeen thousand, eight hundred sixty-five".