6479809529209 has 9 divisors (see below), whose sum is σ = 6504674968623. Its totient is φ = 6455038811352.

The previous prime is 6479809529203. The next prime is 6479809529243. The reversal of 6479809529209 is 9029259089746.

The square root of 6479809529209 is 2545547.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 426339784809 + 6053469744400 = 652947^2 + 2460380^2 .

It is not a de Polignac number, because 6479809529209 - 2⁵ = 6479809529177 is a prime.

It is a super-5 number, since 5×6479809529209⁵ (a number of 65 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6479809529203) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 684747412 + ... + 684756874.

Almost surely, 2^{6479809529209} is an apocalyptic number.

6479809529209 is the 2545547-th square number.

6479809529209 is the 1272774-th centered octagonal number.

It is an amenable number.

6479809529209 is a deficient number, since it is larger than the sum of its proper divisors (24865439414).

6479809529209 is an frugal number, since it uses more digits than its factorization.

6479809529209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19464 (or 9732 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 70.

The spelling of 6479809529209 in words is "six trillion, four hundred seventy-nine billion, eight hundred nine million, five hundred twenty-nine thousand, two hundred nine".