6561713273 has 4 divisors (see below), whose sum is σ = 6659649360. Its totient is φ = 6463777188.

The previous prime is 6561713243. The next prime is 6561713293. The reversal of 6561713273 is 3723171656.

It is a happy number.

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 6561713273 - 2¹⁰ = 6561712249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6561713273.

It is not an unprimeable number, because it can be changed into a prime (6561713243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48967943 + ... + 48968076.

It is an arithmetic number, because the mean of its divisors is an integer number (1664912340).

Almost surely, 2^6561713273 is an apocalyptic number.

It is an amenable number.

6561713273 is a deficient number, since it is larger than the sum of its proper divisors (97936087).

6561713273 is an equidigital number, since it uses as much as digits as its factorization.

6561713273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97936086.

The product of its digits is 158760, while the sum is 41.

The square root of 6561713273 is about 81004.4028000948. The cubic root of 6561713273 is about 1872.1432786007.

The spelling of 6561713273 in words is "six billion, five hundred sixty-one million, seven hundred thirteen thousand, two hundred seventy-three".