6777388789 has 2 divisors, whose sum is σ = 6777388790. Its totient is φ = 6777388788.

The previous prime is 6777388781. The next prime is 6777388831. The reversal of 6777388789 is 9878837776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4495702500 + 2281686289 = 67050^2 + 47767^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777388789 - 2³ = 6777388781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6777388781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388694394 + 3388694395.

It is an arithmetic number, because the mean of its divisors is an integer number (3388694395).

Almost surely, 2^6777388789 is an apocalyptic number.

It is an amenable number.

6777388789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777388789 is an equidigital number, since it uses as much as digits as its factorization.

6777388789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 199148544, while the sum is 70.

The square root of 6777388789 is about 82324.8977466720. The cubic root of 6777388789 is about 1892.4342521688.

The spelling of 6777388789 in words is "six billion, seven hundred seventy-seven million, three hundred eighty-eight thousand, seven hundred eighty-nine".