12164165661 has 4 divisors (see below), whose sum is σ = 16218887552. Its totient is φ = 8109443772.

The previous prime is 12164165659. The next prime is 12164165719. The reversal of 12164165661 is 16656146121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16656146121 = 3 ⋅5552048707.

It is not a de Polignac number, because 12164165661 - 2¹ = 12164165659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12164965661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027360941 + ... + 2027360946.

It is an arithmetic number, because the mean of its divisors is an integer number (4054721888).

Almost surely, 2^12164165661 is an apocalyptic number.

It is an amenable number.

12164165661 is a deficient number, since it is larger than the sum of its proper divisors (4054721891).

12164165661 is an equidigital number, since it uses as much as digits as its factorization.

12164165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054721890.

The product of its digits is 51840, while the sum is 39.

The spelling of 12164165661 in words is "twelve billion, one hundred sixty-four million, one hundred sixty-five thousand, six hundred sixty-one".