126630560261 has 2 divisors, whose sum is σ = 126630560262. Its totient is φ = 126630560260.

The previous prime is 126630560197. The next prime is 126630560263. The reversal of 126630560261 is 162065036621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121717952161 + 4912608100 = 348881^2 + 70090^2 .

It is a cyclic number.

It is not a de Polignac number, because 126630560261 - 2⁶ = 126630560197 is a prime.

Together with 126630560263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126630560263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63315280130 + 63315280131.

It is an arithmetic number, because the mean of its divisors is an integer number (63315280131).

Almost surely, 2^126630560261 is an apocalyptic number.

It is an amenable number.

126630560261 is a deficient number, since it is larger than the sum of its proper divisors (1).

126630560261 is an equidigital number, since it uses as much as digits as its factorization.

126630560261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

Adding to 126630560261 its reverse (162065036621), we get a palindrome (288695596882).

The spelling of 126630560261 in words is "one hundred twenty-six billion, six hundred thirty million, five hundred sixty thousand, two hundred sixty-one".