128815026594909 has 32 divisors (see below), whose sum is σ = 178014989416320. Its totient is φ = 82796231654400.

The previous prime is 128815026594901. The next prime is 128815026594937. The reversal of 128815026594909 is 909495620518821.

It is not a de Polignac number, because 128815026594909 - 2³ = 128815026594901 is a prime.

It is a super-2 number, since 2×128815026594909² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128815026594901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17210854 + ... + 23533880.

It is an arithmetic number, because the mean of its divisors is an integer number (5562968419260).

Almost surely, 2^{128815026594909} is an apocalyptic number.

It is an amenable number.

128815026594909 is a deficient number, since it is larger than the sum of its proper divisors (49199962821411).

128815026594909 is a wasteful number, since it uses less digits than its factorization.

128815026594909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6325021.

The product of its (nonzero) digits is 111974400, while the sum is 69.

The spelling of 128815026594909 in words is "one hundred twenty-eight trillion, eight hundred fifteen billion, twenty-six million, five hundred ninety-four thousand, nine hundred nine".