6667777666 has 16 divisors (see below), whose sum is σ = 11007469728. Its totient is φ = 3003985600.

The previous prime is 6667777663. The next prime is 6667777667.

6667777666 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×6667777666³ (a number of 30 digits) contains 333 as substring.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6667777598 and 6667777607.

It is not an unprimeable number, because it can be changed into a prime (6667777661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338580 + ... + 1343551.

It is an arithmetic number, because the mean of its divisors is an integer number (687966858).

Almost surely, 2^6667777666 is an apocalyptic number.

6667777666 is a deficient number, since it is larger than the sum of its proper divisors (4339692062).

6667777666 is a wasteful number, since it uses less digits than its factorization.

6667777666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682257.

The product of its digits is 112021056, while the sum is 64.

The square root of 6667777666 is about 81656.4612630256. The cubic root of 6667777666 is about 1882.1766009950.

The spelling of 6667777666 in words is "six billion, six hundred sixty-seven million, seven hundred seventy-seven thousand, six hundred sixty-six".