77798755789777 has 4 divisors (see below), whose sum is σ = 84871369952496. Its totient is φ = 70726141627060.

The previous prime is 77798755789739. The next prime is 77798755789801.

77798755789777 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77798755789777 - 2¹⁹ = 77798755265489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77798755789877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536307081343 + ... + 3536307081364.

It is an arithmetic number, because the mean of its divisors is an integer number (21217842488124).

Almost surely, 2^{77798755789777} is an apocalyptic number.

It is an amenable number.

77798755789777 is a deficient number, since it is larger than the sum of its proper divisors (7072614162719).

77798755789777 is a wasteful number, since it uses less digits than its factorization.

77798755789777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072614162718.

The product of its digits is 747118209600, while the sum is 100.

The spelling of 77798755789777 in words is "seventy-seven trillion, seven hundred ninety-eight billion, seven hundred fifty-five million, seven hundred eighty-nine thousand, seven hundred seventy-seven".