6778558751 has 2 divisors, whose sum is σ = 6778558752. Its totient is φ = 6778558750.

The previous prime is 6778558729. The next prime is 6778558783. The reversal of 6778558751 is 1578558776.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778558751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778558951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389279375 + 3389279376.

It is an arithmetic number, because the mean of its divisors is an integer number (3389279376).

Almost surely, 2^6778558751 is an apocalyptic number.

6778558751 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778558751 is an equidigital number, since it uses as much as digits as its factorization.

6778558751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16464000, while the sum is 59.

The square root of 6778558751 is about 82332.0032004566. The cubic root of 6778558751 is about 1892.5431411446.

The spelling of 6778558751 in words is "six billion, seven hundred seventy-eight million, five hundred fifty-eight thousand, seven hundred fifty-one".