11571273561 has 8 divisors (see below), whose sum is σ = 15429344224. Its totient is φ = 7713692640.

The previous prime is 11571273517. The next prime is 11571273577. The reversal of 11571273561 is 16537217511.

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

It is not a de Polignac number, because 11571273561 - 2¹⁹ = 11570749273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11571275561) 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, 63211 + ... + 164736.

It is an arithmetic number, because the mean of its divisors is an integer number (1928668028).

Almost surely, 2^11571273561 is an apocalyptic number.

It is an amenable number.

11571273561 is a deficient number, since it is larger than the sum of its proper divisors (3858070663).

11571273561 is a wasteful number, since it uses less digits than its factorization.

11571273561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244871.

The product of its digits is 44100, while the sum is 39.

The spelling of 11571273561 in words is "eleven billion, five hundred seventy-one million, two hundred seventy-three thousand, five hundred sixty-one".