126326250581 has 2 divisors, whose sum is σ = 126326250582. Its totient is φ = 126326250580.

The previous prime is 126326250553. The next prime is 126326250637. The reversal of 126326250581 is 185052623621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115019331025 + 11306919556 = 339145^2 + 106334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126326250581 is a prime.

It is a super-2 number, since 2×126326250581² (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 (126326250511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63163125290 + 63163125291.

It is an arithmetic number, because the mean of its divisors is an integer number (63163125291).

Almost surely, 2^126326250581 is an apocalyptic number.

It is an amenable number.

126326250581 is a deficient number, since it is larger than the sum of its proper divisors (1).

126326250581 is an equidigital number, since it uses as much as digits as its factorization.

126326250581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 126326250581 in words is "one hundred twenty-six billion, three hundred twenty-six million, two hundred fifty thousand, five hundred eighty-one".