126720512069 has 2 divisors, whose sum is σ = 126720512070. Its totient is φ = 126720512068.

The previous prime is 126720512053. The next prime is 126720512081. The reversal of 126720512069 is 960215027621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104385209569 + 22335302500 = 323087^2 + 149450^2 .

It is a cyclic number.

It is not a de Polignac number, because 126720512069 - 2⁴ = 126720512053 is a prime.

It is a super-2 number, since 2×126720512069² (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 (126720512669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63360256034 + 63360256035.

It is an arithmetic number, because the mean of its divisors is an integer number (63360256035).

Almost surely, 2^126720512069 is an apocalyptic number.

It is an amenable number.

126720512069 is a deficient number, since it is larger than the sum of its proper divisors (1).

126720512069 is an equidigital number, since it uses as much as digits as its factorization.

126720512069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 126720512069 in words is "one hundred twenty-six billion, seven hundred twenty million, five hundred twelve thousand, sixty-nine".