11171785779 has 24 divisors (see below), whose sum is σ = 20118888192. Its totient is φ = 5803524720.

The previous prime is 11171785777. The next prime is 11171785789. The reversal of 11171785779 is 97758717111.

It is not a de Polignac number, because 11171785779 - 2¹ = 11171785777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11171785771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8059759 + ... + 8061144.

It is an arithmetic number, because the mean of its divisors is an integer number (838287008).

Almost surely, 2^11171785779 is an apocalyptic number.

11171785779 is a deficient number, since it is larger than the sum of its proper divisors (8947102413).

11171785779 is a wasteful number, since it uses less digits than its factorization.

11171785779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16120927 (or 16120924 counting only the distinct ones).

The product of its digits is 864360, while the sum is 54.

The spelling of 11171785779 in words is "eleven billion, one hundred seventy-one million, seven hundred eighty-five thousand, seven hundred seventy-nine".