77796566569777 has 4 divisors (see below), whose sum is σ = 84868981712496. Its totient is φ = 70724151427060.

The previous prime is 77796566569691. The next prime is 77796566569783.

77796566569777 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 77796566569777 - 2¹⁹ = 77796566045489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77796566560777) 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, 3536207571343 + ... + 3536207571364.

It is an arithmetic number, because the mean of its divisors is an integer number (21217245428124).

Almost surely, 2^{77796566569777} is an apocalyptic number.

It is an amenable number.

77796566569777 is a deficient number, since it is larger than the sum of its proper divisors (7072415142719).

77796566569777 is a wasteful number, since it uses less digits than its factorization.

77796566569777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072415142718.

The product of its digits is 308758035600, while the sum is 94.

The spelling of 77796566569777 in words is "seventy-seven trillion, seven hundred ninety-six billion, five hundred sixty-six million, five hundred sixty-nine thousand, seven hundred seventy-seven".