128698202097529 has 27 divisors (see below), whose sum is σ = 131643680087493. Its totient is φ = 125818292833272.

The previous prime is 128698202097511. The next prime is 128698202097571. The reversal of 128698202097529 is 925790202896821.

The square root of 128698202097529 is 11344523.

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

It is not a de Polignac number, because 128698202097529 - 2²⁵ = 128698168543097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128698206097529) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 96984326464 + ... + 96984327790.

Almost surely, 2^{128698202097529} is an apocalyptic number.

128698202097529 is the 11344523-rd square number.

128698202097529 is the 5672262-nd centered octagonal number.

It is an amenable number.

128698202097529 is a deficient number, since it is larger than the sum of its proper divisors (2945477989964).

128698202097529 is an frugal number, since it uses more digits than its factorization.

128698202097529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026 (or 1513 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 70.

The spelling of 128698202097529 in words is "one hundred twenty-eight trillion, six hundred ninety-eight billion, two hundred two million, ninety-seven thousand, five hundred twenty-nine".