6666776671 has 2 divisors, whose sum is σ = 6666776672. Its totient is φ = 6666776670.

The previous prime is 6666776663. The next prime is 6666776687. The reversal of 6666776671 is 1766776666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6666776671 - 2³ = 6666776663 is a prime.

It is a super-2 number, since 2×6666776671² = 88891822361979684482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666776771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333388335 + 3333388336.

It is an arithmetic number, because the mean of its divisors is an integer number (3333388336).

Almost surely, 2^6666776671 is an apocalyptic number.

6666776671 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666776671 is an equidigital number, since it uses as much as digits as its factorization.

6666776671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 58.

The square root of 6666776671 is about 81650.3317262092. The cubic root of 6666776671 is about 1882.0824095092.

The spelling of 6666776671 in words is "six billion, six hundred sixty-six million, seven hundred seventy-six thousand, six hundred seventy-one".