128708230851225 has 27 divisors (see below), whose sum is σ = 230531047170879. Its totient is φ = 68644299027600.

The previous prime is 128708230851107. The next prime is 128708230851293. The reversal of 128708230851225 is 522158032807821.

The square root of 128708230851225 is 11344965.

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

128708230851225 is a `hidden beast` number, since 1 + 2 + 8 + 70 + 8 + 2 + 30 + 8 + 512 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46334963106441 + 82373267744784 = 6806979^2 + 9075972^2 .

It is not a de Polignac number, because 128708230851225 - 2⁷ = 128708230851097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 169796310 + ... + 170552640.

Almost surely, 2^{128708230851225} is an apocalyptic number.

128708230851225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128708230851225 is the 11344965-th square number.

128708230851225 is the 5672483-rd centered octagonal number.

It is an amenable number.

128708230851225 is a deficient number, since it is larger than the sum of its proper divisors (101822816319654).

128708230851225 is an frugal number, since it uses more digits than its factorization.

128708230851225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512678 (or 756339 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 128708230851225 in words is "one hundred twenty-eight trillion, seven hundred eight billion, two hundred thirty million, eight hundred fifty-one thousand, two hundred twenty-five".