12544411445521 has 2 divisors, whose sum is σ = 12544411445522. Its totient is φ = 12544411445520.

The previous prime is 12544411445473. The next prime is 12544411445561. The reversal of 12544411445521 is 12554411444521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11818200693121 + 726210752400 = 3437761^2 + 852180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12544411445521 - 2¹⁹ = 12544410921233 is a prime.

It is a super-2 number, since 2×12544411445521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12544411445561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272205722760 + 6272205722761.

It is an arithmetic number, because the mean of its divisors is an integer number (6272205722761).

Almost surely, 2^{12544411445521} is an apocalyptic number.

It is an amenable number.

12544411445521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12544411445521 is an equidigital number, since it uses as much as digits as its factorization.

12544411445521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512000, while the sum is 43.

It can be divided in two parts, 1254441 and 1445521, that added together give a palindrome (2699962).

The spelling of 12544411445521 in words is "twelve trillion, five hundred forty-four billion, four hundred eleven million, four hundred forty-five thousand, five hundred twenty-one".