128985261055 has 8 divisors (see below), whose sum is σ = 176894072352. Its totient is φ = 88447036128.

The previous prime is 128985261047. The next prime is 128985261061. The reversal of 128985261055 is 550162589821.

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 128985261055 - 2³ = 128985261047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128985260993 and 128985261011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842646552 + ... + 1842646621.

It is an arithmetic number, because the mean of its divisors is an integer number (22111759044).

Almost surely, 2^128985261055 is an apocalyptic number.

128985261055 is a deficient number, since it is larger than the sum of its proper divisors (47908811297).

128985261055 is an equidigital number, since it uses as much as digits as its factorization.

128985261055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685293185.

The product of its (nonzero) digits is 1728000, while the sum is 52.

The spelling of 128985261055 in words is "one hundred twenty-eight billion, nine hundred eighty-five million, two hundred sixty-one thousand, fifty-five".