11820572905 has 4 divisors (see below), whose sum is σ = 14184687492. Its totient is φ = 9456458320.

The previous prime is 11820572899. The next prime is 11820572917. The reversal of 11820572905 is 50927502811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50927502811 = 317 ⋅160654583.

It can be written as a sum of positive squares in 2 ways, for example, as 6834659584 + 4985913321 = 82672^2 + 70611^2 .

It is not a de Polignac number, because 11820572905 - 2²⁵ = 11787018473 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1182057286 + ... + 1182057295.

It is an arithmetic number, because the mean of its divisors is an integer number (3546171873).

Almost surely, 2^11820572905 is an apocalyptic number.

It is an amenable number.

11820572905 is a deficient number, since it is larger than the sum of its proper divisors (2364114587).

11820572905 is an equidigital number, since it uses as much as digits as its factorization.

11820572905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364114586.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 11820572905 in words is "eleven billion, eight hundred twenty million, five hundred seventy-two thousand, nine hundred five".