12170685779 has 16 divisors (see below), whose sum is σ = 14331076800. Its totient is φ = 10120412160.

The previous prime is 12170685757. The next prime is 12170685803. The reversal of 12170685779 is 97758607121.

It is a cyclic number.

It is not a de Polignac number, because 12170685779 - 2⁸ = 12170685523 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12170685779.

It is not an unprimeable number, because it can be changed into a prime (12170685719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164054 + ... + 226395.

It is an arithmetic number, because the mean of its divisors is an integer number (895692300).

Almost surely, 2^12170685779 is an apocalyptic number.

12170685779 is a deficient number, since it is larger than the sum of its proper divisors (2160391021).

12170685779 is an equidigital number, since it uses as much as digits as its factorization.

12170685779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390590.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 12170685779 in words is "twelve billion, one hundred seventy million, six hundred eighty-five thousand, seven hundred seventy-nine".