77751677615809 has 2 divisors, whose sum is σ = 77751677615810. Its totient is φ = 77751677615808.

The previous prime is 77751677615767. The next prime is 77751677615881. The reversal of 77751677615809 is 90851677615777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76023315148225 + 1728362467584 = 8719135^2 + 1314672^2 .

It is a cyclic number.

It is not a de Polignac number, because 77751677615809 - 2⁷ = 77751677615681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77751677615309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38875838807904 + 38875838807905.

It is an arithmetic number, because the mean of its divisors is an integer number (38875838807905).

Almost surely, 2^{77751677615809} is an apocalyptic number.

It is an amenable number.

77751677615809 is a deficient number, since it is larger than the sum of its proper divisors (1).

77751677615809 is an equidigital number, since it uses as much as digits as its factorization.

77751677615809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1089093600, while the sum is 76.

The spelling of 77751677615809 in words is "seventy-seven trillion, seven hundred fifty-one billion, six hundred seventy-seven million, six hundred fifteen thousand, eight hundred nine".