12605053520581 has 2 divisors, whose sum is σ = 12605053520582. Its totient is φ = 12605053520580.

The previous prime is 12605053520561. The next prime is 12605053520627. The reversal of 12605053520581 is 18502535050621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9846102622500 + 2758950898081 = 3137850^2 + 1661009^2 .

It is a cyclic number.

It is not a de Polignac number, because 12605053520581 - 2²¹ = 12605051423429 is a prime.

It is a super-2 number, since 2×12605053520581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12605053520531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6302526760290 + 6302526760291.

It is an arithmetic number, because the mean of its divisors is an integer number (6302526760291).

Almost surely, 2^{12605053520581} is an apocalyptic number.

It is an amenable number.

12605053520581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12605053520581 is an equidigital number, since it uses as much as digits as its factorization.

12605053520581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 12605053520581 in words is "twelve trillion, six hundred five billion, fifty-three million, five hundred twenty thousand, five hundred eighty-one".