12605040421553 has 2 divisors, whose sum is σ = 12605040421554. Its totient is φ = 12605040421552.

The previous prime is 12605040421549. The next prime is 12605040421639. The reversal of 12605040421553 is 35512404050621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8475597818944 + 4129442602609 = 2911288^2 + 2032103^2 .

It is an emirp because it is prime and its reverse (35512404050621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12605040421553 - 2² = 12605040421549 is a prime.

It is not a weakly prime, because it can be changed into another prime (12605040921553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6302520210776 + 6302520210777.

It is an arithmetic number, because the mean of its divisors is an integer number (6302520210777).

Almost surely, 2^{12605040421553} is an apocalyptic number.

It is an amenable number.

12605040421553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12605040421553 is an equidigital number, since it uses as much as digits as its factorization.

12605040421553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 12605040421553 in words is "twelve trillion, six hundred five billion, forty million, four hundred twenty-one thousand, five hundred fifty-three".