6666766669 has 2 divisors, whose sum is σ = 6666766670. Its totient is φ = 6666766668.

The previous prime is 6666766657. The next prime is 6666766681. The reversal of 6666766669 is 9666676666.

It is a balanced prime because it is at equal distance from previous prime (6666766657) and next prime (6666766681).

It can be written as a sum of positive squares in only one way, i.e., 3681455625 + 2985311044 = 60675^2 + 54638^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666766669 - 2⁹ = 6666766157 is a prime.

It is a super-2 number, since 2×6666766669² = 88891555637778711122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6666766669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666766609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333383334 + 3333383335.

It is an arithmetic number, because the mean of its divisors is an integer number (3333383335).

Almost surely, 2^6666766669 is an apocalyptic number.

It is an amenable number.

6666766669 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666766669 is an equidigital number, since it uses as much as digits as its factorization.

6666766669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105815808, while the sum is 64.

The square root of 6666766669 is about 81650.2704772005. The cubic root of 6666766669 is about 1882.0814682949.

The spelling of 6666766669 in words is "six billion, six hundred sixty-six million, seven hundred sixty-six thousand, six hundred sixty-nine".