125868138769 has 2 divisors, whose sum is σ = 125868138770. Its totient is φ = 125868138768.

The previous prime is 125868138761. The next prime is 125868138859. The reversal of 125868138769 is 967831868521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114996948544 + 10871190225 = 339112^2 + 104265^2 .

It is a cyclic number.

It is not a de Polignac number, because 125868138769 - 2³ = 125868138761 is a prime.

It is a super-2 number, since 2×125868138769² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125868138769.

It is not a weakly prime, because it can be changed into another prime (125868138761) 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, 62934069384 + 62934069385.

It is an arithmetic number, because the mean of its divisors is an integer number (62934069385).

Almost surely, 2^125868138769 is an apocalyptic number.

It is an amenable number.

125868138769 is a deficient number, since it is larger than the sum of its proper divisors (1).

125868138769 is an equidigital number, since it uses as much as digits as its factorization.

125868138769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 64.

The spelling of 125868138769 in words is "one hundred twenty-five billion, eight hundred sixty-eight million, one hundred thirty-eight thousand, seven hundred sixty-nine".