11380128805 has 4 divisors (see below), whose sum is σ = 13656154572. Its totient is φ = 9104103040.

The previous prime is 11380128787. The next prime is 11380128811. The reversal of 11380128805 is 50882108311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8389460836 + 2990667969 = 91594^2 + 54687^2 .

It is not a de Polignac number, because 11380128805 - 2²⁵ = 11346574373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1138012876 + ... + 1138012885.

It is an arithmetic number, because the mean of its divisors is an integer number (3414038643).

Almost surely, 2^11380128805 is an apocalyptic number.

It is an amenable number.

11380128805 is a deficient number, since it is larger than the sum of its proper divisors (2276025767).

11380128805 is an equidigital number, since it uses as much as digits as its factorization.

11380128805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276025766.

The product of its (nonzero) digits is 15360, while the sum is 37.

It can be divided in two parts, 11380 and 128805, that added together give a triangular number (140185 = T₅₂₉).

The spelling of 11380128805 in words is "eleven billion, three hundred eighty million, one hundred twenty-eight thousand, eight hundred five".