6671785777 has 2 divisors, whose sum is σ = 6671785778. Its totient is φ = 6671785776.

The previous prime is 6671785751. The next prime is 6671785781. The reversal of 6671785777 is 7775871766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6671785761 + 16 = 81681^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6671785777 is a prime.

It is not a weakly prime, because it can be changed into another prime (6671785717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335892888 + 3335892889.

It is an arithmetic number, because the mean of its divisors is an integer number (3335892889).

Almost surely, 2^6671785777 is an apocalyptic number.

It is an amenable number.

6671785777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671785777 is an equidigital number, since it uses as much as digits as its factorization.

6671785777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24202080, while the sum is 61.

The square root of 6671785777 is about 81681.0000979420. Note that the first 4 decimals coincide. The cubic root of 6671785777 is about 1882.5536612400.

The spelling of 6671785777 in words is "six billion, six hundred seventy-one million, seven hundred eighty-five thousand, seven hundred seventy-seven".