126529416581 has 2 divisors, whose sum is σ = 126529416582. Its totient is φ = 126529416580.

The previous prime is 126529416577. The next prime is 126529416617. The reversal of 126529416581 is 185614925621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124615354081 + 1914062500 = 353009^2 + 43750^2 .

It is a cyclic number.

It is not a de Polignac number, because 126529416581 - 2² = 126529416577 is a prime.

It is a super-2 number, since 2×126529416581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126529416781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63264708290 + 63264708291.

It is an arithmetic number, because the mean of its divisors is an integer number (63264708291).

Almost surely, 2^126529416581 is an apocalyptic number.

It is an amenable number.

126529416581 is a deficient number, since it is larger than the sum of its proper divisors (1).

126529416581 is an equidigital number, since it uses as much as digits as its factorization.

126529416581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 50.

The spelling of 126529416581 in words is "one hundred twenty-six billion, five hundred twenty-nine million, four hundred sixteen thousand, five hundred eighty-one".