6666776771 has 2 divisors, whose sum is σ = 6666776772. Its totient is φ = 6666776770.

The previous prime is 6666776761. The next prime is 6666776813. The reversal of 6666776771 is 1776776666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666776771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666776771.

It is not a weakly prime, because it can be changed into another prime (6666776761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333388385 + 3333388386.

It is an arithmetic number, because the mean of its divisors is an integer number (3333388386).

Almost surely, 2^6666776771 is an apocalyptic number.

6666776771 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666776771 is an equidigital number, since it uses as much as digits as its factorization.

6666776771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18670176, while the sum is 59.

The square root of 6666776771 is about 81650.3323385766. The cubic root of 6666776771 is about 1882.0824189195.

The spelling of 6666776771 in words is "six billion, six hundred sixty-six million, seven hundred seventy-six thousand, seven hundred seventy-one".