126765420709 has 2 divisors, whose sum is σ = 126765420710. Its totient is φ = 126765420708.

The previous prime is 126765420707. The next prime is 126765420739. The reversal of 126765420709 is 907024567621.

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., 126609295684 + 156125025 = 355822^2 + 12495^2 .

It is a cyclic number.

It is not a de Polignac number, because 126765420709 - 2¹ = 126765420707 is a prime.

Together with 126765420707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126765420703) 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, 63382710354 + 63382710355.

It is an arithmetic number, because the mean of its divisors is an integer number (63382710355).

Almost surely, 2^126765420709 is an apocalyptic number.

It is an amenable number.

126765420709 is a deficient number, since it is larger than the sum of its proper divisors (1).

126765420709 is an equidigital number, since it uses as much as digits as its factorization.

126765420709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 126765420709 in words is "one hundred twenty-six billion, seven hundred sixty-five million, four hundred twenty thousand, seven hundred nine".