125645633129 has 2 divisors, whose sum is σ = 125645633130. Its totient is φ = 125645633128.

The previous prime is 125645633111. The next prime is 125645633137. The reversal of 125645633129 is 921336546521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79607493904 + 46038139225 = 282148^2 + 214565^2 .

It is a cyclic number.

It is not a de Polignac number, because 125645633129 - 2²⁰ = 125644584553 is a prime.

It is not a weakly prime, because it can be changed into another prime (125645633629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62822816564 + 62822816565.

It is an arithmetic number, because the mean of its divisors is an integer number (62822816565).

Almost surely, 2^125645633129 is an apocalyptic number.

It is an amenable number.

125645633129 is a deficient number, since it is larger than the sum of its proper divisors (1).

125645633129 is an equidigital number, since it uses as much as digits as its factorization.

125645633129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 47.

The spelling of 125645633129 in words is "one hundred twenty-five billion, six hundred forty-five million, six hundred thirty-three thousand, one hundred twenty-nine".