128497156225 has 9 divisors (see below), whose sum is σ = 159338696233. Its totient is φ = 102796291120.

The previous prime is 128497156223. The next prime is 128497156231. The reversal of 128497156225 is 522651794821.

It is a happy number.

The square root of 128497156225 is 358465.

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

It can be written as a sum of positive squares in 4 ways, for example, as 26822905729 + 101674250496 = 163777^2 + 318864^2 .

It is not a de Polignac number, because 128497156225 - 2¹ = 128497156223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128497156223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1756479 + ... + 1828171.

Almost surely, 2^128497156225 is an apocalyptic number.

128497156225 is the 358465-th square number.

128497156225 is the 179233-rd centered octagonal number.

It is an amenable number.

128497156225 is a deficient number, since it is larger than the sum of its proper divisors (30841540008).

128497156225 is an frugal number, since it uses more digits than its factorization.

128497156225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143396 (or 71698 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 52.

The spelling of 128497156225 in words is "one hundred twenty-eight billion, four hundred ninety-seven million, one hundred fifty-six thousand, two hundred twenty-five".