12111661065 has 64 divisors (see below), whose sum is σ = 22933900800. Its totient is φ = 5340432384.

The previous prime is 12111661049. The next prime is 12111661109. The reversal of 12111661065 is 56016611121.

It is not a de Polignac number, because 12111661065 - 2⁴ = 12111661049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5336751 + ... + 5339019.

It is an arithmetic number, because the mean of its divisors is an integer number (358342200).

Almost surely, 2^12111661065 is an apocalyptic number.

12111661065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12111661065 is a deficient number, since it is larger than the sum of its proper divisors (10822239735).

12111661065 is a wasteful number, since it uses less digits than its factorization.

12111661065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 12111661065 in words is "twelve billion, one hundred eleven million, six hundred sixty-one thousand, sixty-five".