6666777329 has 2 divisors, whose sum is σ = 6666777330. Its totient is φ = 6666777328.

The previous prime is 6666777289. The next prime is 6666777347. The reversal of 6666777329 is 9237776666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5828559025 + 838218304 = 76345^2 + 28952^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666777329 - 2²⁰ = 6665728753 is a prime.

It is not a weakly prime, because it can be changed into another prime (6666777389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333388664 + 3333388665.

It is an arithmetic number, because the mean of its divisors is an integer number (3333388665).

Almost surely, 2^6666777329 is an apocalyptic number.

It is an amenable number.

6666777329 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666777329 is an equidigital number, since it uses as much as digits as its factorization.

6666777329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24004512, while the sum is 59.

The square root of 6666777329 is about 81650.3357555865. The cubic root of 6666777329 is about 1882.0824714287.

The spelling of 6666777329 in words is "six billion, six hundred sixty-six million, seven hundred seventy-seven thousand, three hundred twenty-nine".