129560403025 has 27 divisors (see below), whose sum is σ = 161925735699. Its totient is φ = 102834846720.

The previous prime is 129560403019. The next prime is 129560403041. The reversal of 129560403025 is 520304065921.

The square root of 129560403025 is 359945.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 108368031249 + 21192371776 = 329193^2 + 145576^2 .

It is not a de Polignac number, because 129560403025 - 2³ = 129560403017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 26 ways as a sum of consecutive naturals, for example, 347346739 + ... + 347347111.

Almost surely, 2^129560403025 is an apocalyptic number.

129560403025 is the 359945-th square number.

129560403025 is the 179973-rd centered octagonal number.

It is an amenable number.

129560403025 is a deficient number, since it is larger than the sum of its proper divisors (32365332674).

129560403025 is an frugal number, since it uses more digits than its factorization.

129560403025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 129560403025 its reverse (520304065921), we get a palindrome (649864468946).

The spelling of 129560403025 in words is "one hundred twenty-nine billion, five hundred sixty million, four hundred three thousand, twenty-five".