128580818077 has 8 divisors (see below), whose sum is σ = 134509188600. Its totient is φ = 122752084224.

The previous prime is 128580818059. The next prime is 128580818111. The reversal of 128580818077 is 770818085821.

It can be written as a sum of positive squares in 4 ways, for example, as 2744607321 + 125836210756 = 52389^2 + 354734^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128580818077 - 2²⁷ = 128446600349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128580818017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24906528 + ... + 24911689.

It is an arithmetic number, because the mean of its divisors is an integer number (16813648575).

Almost surely, 2^128580818077 is an apocalyptic number.

It is an amenable number.

128580818077 is a deficient number, since it is larger than the sum of its proper divisors (5928370523).

128580818077 is an equidigital number, since it uses as much as digits as its factorization.

128580818077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49818335.

The product of its (nonzero) digits is 2007040, while the sum is 55.

The spelling of 128580818077 in words is "one hundred twenty-eight billion, five hundred eighty million, eight hundred eighteen thousand, seventy-seven".