6778899349 has 2 divisors, whose sum is σ = 6778899350. Its totient is φ = 6778899348.

The previous prime is 6778899307. The next prime is 6778899353. The reversal of 6778899349 is 9439988776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3416987025 + 3361912324 = 58455^2 + 57982^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778899349 - 2²⁵ = 6745344917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778899649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389449674 + 3389449675.

It is an arithmetic number, because the mean of its divisors is an integer number (3389449675).

Almost surely, 2^6778899349 is an apocalyptic number.

It is an amenable number.

6778899349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778899349 is an equidigital number, since it uses as much as digits as its factorization.

6778899349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 70.

The square root of 6778899349 is about 82334.0716167979. The cubic root of 6778899349 is about 1892.5748384240.

The spelling of 6778899349 in words is "six billion, seven hundred seventy-eight million, eight hundred ninety-nine thousand, three hundred forty-nine".