6978448777 has 2 divisors, whose sum is σ = 6978448778. Its totient is φ = 6978448776.

The previous prime is 6978448759. The next prime is 6978448817. The reversal of 6978448777 is 7778448796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5995250041 + 983198736 = 77429^2 + 31356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6978448777 is a prime.

It is not a weakly prime, because it can be changed into another prime (6978448177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3489224388 + 3489224389.

It is an arithmetic number, because the mean of its divisors is an integer number (3489224389).

Almost surely, 2^6978448777 is an apocalyptic number.

It is an amenable number.

6978448777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978448777 is an equidigital number, since it uses as much as digits as its factorization.

6978448777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132765696, while the sum is 67.

The square root of 6978448777 is about 83537.1101786505. The cubic root of 6978448777 is about 1910.9660214794.

The spelling of 6978448777 in words is "six billion, nine hundred seventy-eight million, four hundred forty-eight thousand, seven hundred seventy-seven".