6579139495221 has 24 divisors (see below), whose sum is σ = 9682927839000. Its totient is φ = 4303149566976.

The previous prime is 6579139495199. The next prime is 6579139495249. The reversal of 6579139495221 is 1225949319756.

6579139495221 is a `hidden beast` number, since 6 + 5 + 7 + 9 + 13 + 94 + 9 + 522 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 574488202500 + 6004651292721 = 757950^2 + 2450439^2 .

It is not a de Polignac number, because 6579139495221 - 2⁶ = 6579139495157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6579139493221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11149405 + ... + 11724653.

It is an arithmetic number, because the mean of its divisors is an integer number (403455326625).

Almost surely, 2^{6579139495221} is an apocalyptic number.

It is an amenable number.

6579139495221 is a deficient number, since it is larger than the sum of its proper divisors (3103788343779).

6579139495221 is a wasteful number, since it uses less digits than its factorization.

6579139495221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599285 (or 599282 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 63.

The spelling of 6579139495221 in words is "six trillion, five hundred seventy-nine billion, one hundred thirty-nine million, four hundred ninety-five thousand, two hundred twenty-one".