6561671711 has 8 divisors (see below), whose sum is σ = 7506736800. Its totient is φ = 5618527488.

The previous prime is 6561671657. The next prime is 6561671759. The reversal of 6561671711 is 1171761656.

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

It is a de Polignac number, because none of the positive numbers 2^k-6561671711 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 (6561671791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472886 + ... + 486563.

It is an arithmetic number, because the mean of its divisors is an integer number (938342100).

Almost surely, 2^6561671711 is an apocalyptic number.

6561671711 is a deficient number, since it is larger than the sum of its proper divisors (945065089).

6561671711 is an equidigital number, since it uses as much as digits as its factorization.

6561671711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960433.

The product of its digits is 52920, while the sum is 41.

The square root of 6561671711 is about 81004.1462580774. The cubic root of 6561671711 is about 1872.1393258636.

The spelling of 6561671711 in words is "six billion, five hundred sixty-one million, six hundred seventy-one thousand, seven hundred eleven".