9775665779 has 4 divisors (see below), whose sum is σ = 10664362680. Its totient is φ = 8886968880.

The previous prime is 9775665773. The next prime is 9775665791.

9775665779 is nontrivially palindromic in base 10.

9775665779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9775665779 - 2¹² = 9775661683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9775665773) 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 in 3 ways as a sum of consecutive naturals, for example, 444348434 + ... + 444348455.

It is an arithmetic number, because the mean of its divisors is an integer number (2666090670).

Almost surely, 2^9775665779 is an apocalyptic number.

9775665779 is a deficient number, since it is larger than the sum of its proper divisors (888696901).

9775665779 is a wasteful number, since it uses less digits than its factorization.

9775665779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888696900.

The product of its digits is 175032900, while the sum is 68.

The square root of 9775665779 is about 98871.9665982224. The cubic root of 9775665779 is about 2138.2022473519.

The spelling of 9775665779 in words is "nine billion, seven hundred seventy-five million, six hundred sixty-five thousand, seven hundred seventy-nine".