12565144543045 has 16 divisors (see below), whose sum is σ = 15123440958192. Its totient is φ = 10021962726400.

The previous prime is 12565144543027. The next prime is 12565144543051. The reversal of 12565144543045 is 54034544156521.

It can be written as a sum of positive squares in 8 ways, for example, as 67950934276 + 12497193608769 = 260674^2 + 3535137^2 .

It is not a de Polignac number, because 12565144543045 - 2⁷ = 12565144542917 is a prime.

It is a super-2 number, since 2×12565144543045² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12565144543045.

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, 2367699 + ... + 5544031.

It is an arithmetic number, because the mean of its divisors is an integer number (945215059887).

Almost surely, 2^{12565144543045} is an apocalyptic number.

It is an amenable number.

12565144543045 is a deficient number, since it is larger than the sum of its proper divisors (2558296415147).

12565144543045 is a wasteful number, since it uses less digits than its factorization.

12565144543045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178712.

The product of its (nonzero) digits is 5760000, while the sum is 49.

Adding to 12565144543045 its reverse (54034544156521), we get a palindrome (66599688699566).

The spelling of 12565144543045 in words is "twelve trillion, five hundred sixty-five billion, one hundred forty-four million, five hundred forty-three thousand, forty-five".