6505209217 has 16 divisors (see below), whose sum is σ = 7085933568. Its totient is φ = 5936353920.

The previous prime is 6505209203. The next prime is 6505209233. The reversal of 6505209217 is 7129025056.

6505209217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6505209217 - 2¹¹ = 6505207169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6505209257) 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 in 15 ways as a sum of consecutive naturals, for example, 396693 + ... + 412765.

It is an arithmetic number, because the mean of its divisors is an integer number (442870848).

Almost surely, 2^6505209217 is an apocalyptic number.

It is an amenable number.

6505209217 is a deficient number, since it is larger than the sum of its proper divisors (580724351).

6505209217 is a wasteful number, since it uses less digits than its factorization.

6505209217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16440.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 6505209217 is about 80654.8772052875. The cubic root of 6505209217 is about 1866.7539955565.

The spelling of 6505209217 in words is "six billion, five hundred five million, two hundred nine thousand, two hundred seventeen".