6639136797877 has 2 divisors, whose sum is σ = 6639136797878. Its totient is φ = 6639136797876.

The previous prime is 6639136797859. The next prime is 6639136797907. The reversal of 6639136797877 is 7787976319366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5676253835121 + 962882962756 = 2382489^2 + 981266^2 .

It is a cyclic number.

It is not a de Polignac number, because 6639136797877 - 2²³ = 6639128409269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639136797797 and 6639136797806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6639136797857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319568398938 + 3319568398939.

It is an arithmetic number, because the mean of its divisors is an integer number (3319568398939).

Almost surely, 2^{6639136797877} is an apocalyptic number.

It is an amenable number.

6639136797877 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639136797877 is an equidigital number, since it uses as much as digits as its factorization.

6639136797877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024568512, while the sum is 79.

The spelling of 6639136797877 in words is "six trillion, six hundred thirty-nine billion, one hundred thirty-six million, seven hundred ninety-seven thousand, eight hundred seventy-seven".