6779129509 has 2 divisors, whose sum is σ = 6779129510. Its totient is φ = 6779129508.

The previous prime is 6779129419. The next prime is 6779129519. The reversal of 6779129509 is 9059219776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6779052225 + 77284 = 82335^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 6779129509 - 2¹⁵ = 6779096741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6779129509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6779129519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389564754 + 3389564755.

It is an arithmetic number, because the mean of its divisors is an integer number (3389564755).

Almost surely, 2^6779129509 is an apocalyptic number.

It is an amenable number.

6779129509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6779129509 is an equidigital number, since it uses as much as digits as its factorization.

6779129509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The square root of 6779129509 is about 82335.4693251942. The cubic root of 6779129509 is about 1892.5962573434.

The spelling of 6779129509 in words is "six billion, seven hundred seventy-nine million, one hundred twenty-nine thousand, five hundred nine".