12001171566165 has 16 divisors (see below), whose sum is σ = 19202104988928. Its totient is φ = 6400548007616.

The previous prime is 12001171566151. The next prime is 12001171566179. The reversal of 12001171566165 is 56166517110021.

It is an interprime number because it is at equal distance from previous prime (12001171566151) and next prime (12001171566179).

It is a cyclic number.

It is not a de Polignac number, because 12001171566165 - 2⁹ = 12001171565653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3499002 + ... + 6020411.

It is an arithmetic number, because the mean of its divisors is an integer number (1200131561808).

Almost surely, 2^{12001171566165} is an apocalyptic number.

12001171566165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12001171566165 is a deficient number, since it is larger than the sum of its proper divisors (7200933422763).

12001171566165 is an equidigital number, since it uses as much as digits as its factorization.

12001171566165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603468.

The product of its (nonzero) digits is 75600, while the sum is 42.

Adding to 12001171566165 its reverse (56166517110021), we get a palindrome (68167688676186).

The spelling of 12001171566165 in words is "twelve trillion, one billion, one hundred seventy-one million, five hundred sixty-six thousand, one hundred sixty-five".