6561206738079 has 8 divisors (see below), whose sum is σ = 9998029315200. Its totient is φ = 3749260993176.

The previous prime is 6561206738011. The next prime is 6561206738081. The reversal of 6561206738079 is 9708376021656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6561206738079 - 2⁷ = 6561206737951 is a prime.

It is a super-2 number, since 2×6561206738079² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561206738579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156219208029 + ... + 156219208070.

It is an arithmetic number, because the mean of its divisors is an integer number (1249753664400).

Almost surely, 2^{6561206738079} is an apocalyptic number.

6561206738079 is a deficient number, since it is larger than the sum of its proper divisors (3436822577121).

6561206738079 is a wasteful number, since it uses less digits than its factorization.

6561206738079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312438416109.

The product of its (nonzero) digits is 22861440, while the sum is 60.

The spelling of 6561206738079 in words is "six trillion, five hundred sixty-one billion, two hundred six million, seven hundred thirty-eight thousand, seventy-nine".