77127539729 has 2 divisors, whose sum is σ = 77127539730. Its totient is φ = 77127539728.

The previous prime is 77127539719. The next prime is 77127539771. The reversal of 77127539729 is 92793572177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49841455504 + 27286084225 = 223252^2 + 165185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77127539729 is a prime.

It is not a weakly prime, because it can be changed into another prime (77127539719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38563769864 + 38563769865.

It is an arithmetic number, because the mean of its divisors is an integer number (38563769865).

Almost surely, 2^77127539729 is an apocalyptic number.

It is an amenable number.

77127539729 is a deficient number, since it is larger than the sum of its proper divisors (1).

77127539729 is an equidigital number, since it uses as much as digits as its factorization.

77127539729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11668860, while the sum is 59.

The spelling of 77127539729 in words is "seventy-seven billion, one hundred twenty-seven million, five hundred thirty-nine thousand, seven hundred twenty-nine".