12111705865 has 16 divisors (see below), whose sum is σ = 16613655552. Its totient is φ = 8303511744.

The previous prime is 12111705847. The next prime is 12111705871. The reversal of 12111705865 is 56850711121.

It is a cyclic number.

It is not a de Polignac number, because 12111705865 - 2¹⁷ = 12111574793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 158472 + ... + 222118.

It is an arithmetic number, because the mean of its divisors is an integer number (1038353472).

Almost surely, 2^12111705865 is an apocalyptic number.

It is an amenable number.

12111705865 is a deficient number, since it is larger than the sum of its proper divisors (4501949687).

12111705865 is an equidigital number, since it uses as much as digits as its factorization.

12111705865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69096.

The product of its (nonzero) digits is 16800, while the sum is 37.

The spelling of 12111705865 in words is "twelve billion, one hundred eleven million, seven hundred five thousand, eight hundred sixty-five".