64518217 has 4 divisors (see below), whose sum is σ = 64535236. Its totient is φ = 64501200.

The previous prime is 64518191. The next prime is 64518239. The reversal of 64518217 is 71281546.

64518217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59428681 + 5089536 = 7709^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 64518217 - 2⁷ = 64518089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64518617) 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 3 ways as a sum of consecutive naturals, for example, 43 + ... + 11359.

It is an arithmetic number, because the mean of its divisors is an integer number (16133809).

Almost surely, 2^64518217 is an apocalyptic number.

It is an amenable number.

64518217 is a deficient number, since it is larger than the sum of its proper divisors (17019).

64518217 is a wasteful number, since it uses less digits than its factorization.

64518217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17018.

The product of its digits is 13440, while the sum is 34.

The square root of 64518217 is about 8032.3232629171. The cubic root of 64518217 is about 401.0767178462.

The spelling of 64518217 in words is "sixty-four million, five hundred eighteen thousand, two hundred seventeen".