125556430529 has 2 divisors, whose sum is σ = 125556430530. Its totient is φ = 125556430528.

The previous prime is 125556430421. The next prime is 125556430537. The reversal of 125556430529 is 925034655521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107336830129 + 18219600400 = 327623^2 + 134980^2 .

It is an emirp because it is prime and its reverse (925034655521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125556430529 - 2²⁰ = 125555381953 is a prime.

It is not a weakly prime, because it can be changed into another prime (125556430829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62778215264 + 62778215265.

It is an arithmetic number, because the mean of its divisors is an integer number (62778215265).

Almost surely, 2^125556430529 is an apocalyptic number.

It is an amenable number.

125556430529 is a deficient number, since it is larger than the sum of its proper divisors (1).

125556430529 is an equidigital number, since it uses as much as digits as its factorization.

125556430529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 125556430529 in words is "one hundred twenty-five billion, five hundred fifty-six million, four hundred thirty thousand, five hundred twenty-nine".