6778757899 has 2 divisors, whose sum is σ = 6778757900. Its totient is φ = 6778757898.

The previous prime is 6778757807. The next prime is 6778757963. The reversal of 6778757899 is 9987578776.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6778757899 - 2²¹ = 6776660747 is a prime.

It is not a weakly prime, because it can be changed into another prime (6778767899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389378949 + 3389378950.

It is an arithmetic number, because the mean of its divisors is an integer number (3389378950).

Almost surely, 2^6778757899 is an apocalyptic number.

6778757899 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778757899 is an equidigital number, since it uses as much as digits as its factorization.

6778757899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373403520, while the sum is 73.

The square root of 6778757899 is about 82333.2126119223. The cubic root of 6778757899 is about 1892.5616747053.

The spelling of 6778757899 in words is "six billion, seven hundred seventy-eight million, seven hundred fifty-seven thousand, eight hundred ninety-nine".