126242057261 has 2 divisors, whose sum is σ = 126242057262. Its totient is φ = 126242057260.

The previous prime is 126242057243. The next prime is 126242057363. The reversal of 126242057261 is 162750242621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126142177225 + 99880036 = 355165^2 + 9994^2 .

It is a cyclic number.

It is not a de Polignac number, because 126242057261 - 2¹⁴ = 126242040877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126242059261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63121028630 + 63121028631.

It is an arithmetic number, because the mean of its divisors is an integer number (63121028631).

Almost surely, 2^126242057261 is an apocalyptic number.

It is an amenable number.

126242057261 is a deficient number, since it is larger than the sum of its proper divisors (1).

126242057261 is an equidigital number, since it uses as much as digits as its factorization.

126242057261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 126242057261 its reverse (162750242621), we get a palindrome (288992299882).

The spelling of 126242057261 in words is "one hundred twenty-six billion, two hundred forty-two million, fifty-seven thousand, two hundred sixty-one".