129553204225 has 9 divisors (see below), whose sum is σ = 160648204867. Its totient is φ = 103641123640.

The previous prime is 129553204211. The next prime is 129553204303. The reversal of 129553204225 is 522402355921.

The square root of 129553204225 is 359935.

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

It can be written as a sum of positive squares in only one way, i.e., 46639153521 + 82914050704 = 215961^2 + 287948^2 .

It is not a de Polignac number, because 129553204225 - 2¹³ = 129553196033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1763682 + ... + 1835668.

Almost surely, 2^129553204225 is an apocalyptic number.

129553204225 is the 359935-th square number.

129553204225 is the 179968-th centered octagonal number.

It is an amenable number.

129553204225 is a deficient number, since it is larger than the sum of its proper divisors (31095000642).

129553204225 is an frugal number, since it uses more digits than its factorization.

129553204225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143984 (or 71992 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 129553204225 in words is "one hundred twenty-nine billion, five hundred fifty-three million, two hundred four thousand, two hundred twenty-five".