6666777077 has 2 divisors, whose sum is σ = 6666777078. Its totient is φ = 6666777076.

The previous prime is 6666777071. The next prime is 6666777097. The reversal of 6666777077 is 7707776666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4318986961 + 2347790116 = 65719^2 + 48454^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666777077 - 2⁸ = 6666776821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666777071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333388538 + 3333388539.

It is an arithmetic number, because the mean of its divisors is an integer number (3333388539).

Almost surely, 2^6666777077 is an apocalyptic number.

It is an amenable number.

6666777077 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666777077 is an equidigital number, since it uses as much as digits as its factorization.

6666777077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21781872, while the sum is 59.

The square root of 6666777077 is about 81650.3342124207. The cubic root of 6666777077 is about 1882.0824477149.

The spelling of 6666777077 in words is "six billion, six hundred sixty-six million, seven hundred seventy-seven thousand, seventy-seven".