128653494489 has 81 divisors (see below), whose sum is σ = 214156297719. Its totient is φ = 74376506880.

The previous prime is 128653494467. The next prime is 128653494511. The reversal of 128653494489 is 984494356821.

The square root of 128653494489 is 358683.

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

128653494489 is a `hidden beast` number, since 1 + 2 + 8 + 6 + 534 + 94 + 4 + 8 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (128653494467) and next prime (128653494511).

It can be written as a sum of positive squares in 13 ways, for example, as 89211534489 + 39441960000 = 298683^2 + 198600^2 .

It is not a de Polignac number, because 128653494489 - 2¹¹ = 128653492441 is a prime.

It is a super-2 number, since 2×128653494489² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128653494589) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 237806559 + ... + 237807099.

Almost surely, 2^128653494489 is an apocalyptic number.

128653494489 is the 358683-rd square number.

128653494489 is the 179342-nd centered octagonal number.

It is an amenable number.

128653494489 is a deficient number, since it is larger than the sum of its proper divisors (85502803230).

128653494489 is an equidigital number, since it uses as much as digits as its factorization.

128653494489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 574 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 128653494489 in words is "one hundred twenty-eight billion, six hundred fifty-three million, four hundred ninety-four thousand, four hundred eighty-nine".