6566806271 has 4 divisors (see below), whose sum is σ = 6566970000. Its totient is φ = 6566642544.

The previous prime is 6566806243. The next prime is 6566806283. The reversal of 6566806271 is 1726086656.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6566806271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566806241) 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 3 ways as a sum of consecutive naturals, for example, 23510 + ... + 116988.

It is an arithmetic number, because the mean of its divisors is an integer number (1641742500).

Almost surely, 2^6566806271 is an apocalyptic number.

6566806271 is a deficient number, since it is larger than the sum of its proper divisors (163729).

6566806271 is an equidigital number, since it uses as much as digits as its factorization.

6566806271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163728.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 6566806271 is about 81035.8332529505. The cubic root of 6566806271 is about 1872.6275198226.

The spelling of 6566806271 in words is "six billion, five hundred sixty-six million, eight hundred six thousand, two hundred seventy-one".