12165362672521 has 2 divisors, whose sum is σ = 12165362672522. Its totient is φ = 12165362672520.

The previous prime is 12165362672513. The next prime is 12165362672579. The reversal of 12165362672521 is 12527626356121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10591190956921 + 1574171715600 = 3254411^2 + 1254660^2 .

It is an emirp because it is prime and its reverse (12527626356121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12165362672521 - 2³ = 12165362672513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12165362672581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6082681336260 + 6082681336261.

It is an arithmetic number, because the mean of its divisors is an integer number (6082681336261).

Almost surely, 2^{12165362672521} is an apocalyptic number.

It is an amenable number.

12165362672521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12165362672521 is an equidigital number, since it uses as much as digits as its factorization.

12165362672521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The spelling of 12165362672521 in words is "twelve trillion, one hundred sixty-five billion, three hundred sixty-two million, six hundred seventy-two thousand, five hundred twenty-one".