6780533777 has 2 divisors, whose sum is σ = 6780533778. Its totient is φ = 6780533776.

The previous prime is 6780533737. The next prime is 6780533789. The reversal of 6780533777 is 7773350876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6743858641 + 36675136 = 82121^2 + 6056^2 .

It is a cyclic number.

It is not a de Polignac number, because 6780533777 - 2¹² = 6780529681 is a prime.

It is not a weakly prime, because it can be changed into another prime (6780533737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390266888 + 3390266889.

It is an arithmetic number, because the mean of its divisors is an integer number (3390266889).

Almost surely, 2^6780533777 is an apocalyptic number.

It is an amenable number.

6780533777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6780533777 is an equidigital number, since it uses as much as digits as its factorization.

6780533777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5186160, while the sum is 53.

The square root of 6780533777 is about 82343.9966057028. The cubic root of 6780533777 is about 1892.7269294239.

The spelling of 6780533777 in words is "six billion, seven hundred eighty million, five hundred thirty-three thousand, seven hundred seventy-seven".