6666776667 has 36 divisors (see below), whose sum is σ = 9928540440. Its totient is φ = 4310207616.

The previous prime is 6666776663. The next prime is 6666776671. The reversal of 6666776667 is 7666776666.

6666776667 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6666776663) and next prime (6666776671).

It is not a de Polignac number, because 6666776667 - 2² = 6666776663 is a prime.

It is a super-2 number, since 2×6666776667² = 88891822255311257778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6666776663) 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 35 ways as a sum of consecutive naturals, for example, 2248528 + ... + 2251490.

It is an arithmetic number, because the mean of its divisors is an integer number (275792790).

Almost surely, 2^6666776667 is an apocalyptic number.

6666776667 is a deficient number, since it is larger than the sum of its proper divisors (3261763773).

6666776667 is a wasteful number, since it uses less digits than its factorization.

6666776667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164 (or 3108 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 63.

The square root of 6666776667 is about 81650.3317017145. The cubic root of 6666776667 is about 1882.0824091328.

Subtracting 6666776667 from its reverse (7666776666), we obtain a palindrome (999999999).

The spelling of 6666776667 in words is "six billion, six hundred sixty-six million, seven hundred seventy-six thousand, six hundred sixty-seven".