6505018221 has 64 divisors (see below), whose sum is σ = 9880206336. Its totient is φ = 3780096000.

The previous prime is 6505018183. The next prime is 6505018231. The reversal of 6505018221 is 1228105056.

It is not a de Polignac number, because 6505018221 - 2²¹ = 6502921069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6505018231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7590025 + ... + 7590881.

It is an arithmetic number, because the mean of its divisors is an integer number (154378224).

Almost surely, 2^6505018221 is an apocalyptic number.

It is an amenable number.

6505018221 is a deficient number, since it is larger than the sum of its proper divisors (3375188115).

6505018221 is a wasteful number, since it uses less digits than its factorization.

6505018221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 6505018221 is about 80653.6931640455. The cubic root of 6505018221 is about 1866.7357257862.

The spelling of 6505018221 in words is "six billion, five hundred five million, eighteen thousand, two hundred twenty-one".