12165723761 has 2 divisors, whose sum is σ = 12165723762. Its totient is φ = 12165723760.

The previous prime is 12165723733. The next prime is 12165723847. The reversal of 12165723761 is 16732756121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10273038736 + 1892685025 = 101356^2 + 43505^2 .

It is an emirp because it is prime and its reverse (16732756121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12165723761 - 2²⁶ = 12098614897 is a prime.

It is not a weakly prime, because it can be changed into another prime (12165723961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6082861880 + 6082861881.

It is an arithmetic number, because the mean of its divisors is an integer number (6082861881).

Almost surely, 2^12165723761 is an apocalyptic number.

It is an amenable number.

12165723761 is a deficient number, since it is larger than the sum of its proper divisors (1).

12165723761 is an equidigital number, since it uses as much as digits as its factorization.

12165723761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The spelling of 12165723761 in words is "twelve billion, one hundred sixty-five million, seven hundred twenty-three thousand, seven hundred sixty-one".