6505408321 has 4 divisors (see below), whose sum is σ = 6643821312. Its totient is φ = 6366995332.

The previous prime is 6505408319. The next prime is 6505408397. The reversal of 6505408321 is 1238045056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6505408321 - 2¹ = 6505408319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6505403321) 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, 69206425 + ... + 69206518.

It is an arithmetic number, because the mean of its divisors is an integer number (1660955328).

Almost surely, 2^6505408321 is an apocalyptic number.

It is an amenable number.

6505408321 is a deficient number, since it is larger than the sum of its proper divisors (138412991).

6505408321 is a wasteful number, since it uses less digits than its factorization.

6505408321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138412990.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 6505408321 is about 80656.1114919384. Note that the first 3 decimals coincide. The cubic root of 6505408321 is about 1866.7730405190.

The spelling of 6505408321 in words is "six billion, five hundred five million, four hundred eight thousand, three hundred twenty-one".