11545278505 has 4 divisors (see below), whose sum is σ = 13854334212. Its totient is φ = 9236222800.

The previous prime is 11545278499. The next prime is 11545278539. The reversal of 11545278505 is 50587254511.

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 7589371689 + 3955906816 = 87117^2 + 62896^2 .

It is not a de Polignac number, because 11545278505 - 2³ = 11545278497 is a prime.

It is a Duffinian 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, 1154527846 + ... + 1154527855.

It is an arithmetic number, because the mean of its divisors is an integer number (3463583553).

Almost surely, 2^11545278505 is an apocalyptic number.

It is an amenable number.

11545278505 is a deficient number, since it is larger than the sum of its proper divisors (2309055707).

11545278505 is an equidigital number, since it uses as much as digits as its factorization.

11545278505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309055706.

The product of its (nonzero) digits is 280000, while the sum is 43.

The spelling of 11545278505 in words is "eleven billion, five hundred forty-five million, two hundred seventy-eight thousand, five hundred five".