6666776666 has 8 divisors (see below), whose sum is σ = 10909270944. Its totient is φ = 3030353020.

The previous prime is 6666776663. The next prime is 6666776671.

It is a happy number.

6666776666 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×6666776666² = 88891822228644151112, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6666776599 and 6666776608.

It is not an unprimeable number, because it can be changed into a prime (6666776663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151517630 + ... + 151517673.

It is an arithmetic number, because the mean of its divisors is an integer number (1363658868).

Almost surely, 2^6666776666 is an apocalyptic number.

6666776666 is a deficient number, since it is larger than the sum of its proper divisors (4242494278).

6666776666 is a wasteful number, since it uses less digits than its factorization.

6666776666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303035316.

The product of its digits is 82301184, while the sum is 62.

The square root of 6666776666 is about 81650.3316955908. The cubic root of 6666776666 is about 1882.0824090387.

The spelling of 6666776666 in words is "six billion, six hundred sixty-six million, seven hundred seventy-six thousand, six hundred sixty-six".