11771552005 has 4 divisors (see below), whose sum is σ = 14125862412. Its totient is φ = 9417241600.

The previous prime is 11771552003. The next prime is 11771552021. The reversal of 11771552005 is 50025517711.

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 4425176484 + 7346375521 = 66522^2 + 85711^2 .

It is not a de Polignac number, because 11771552005 - 2¹ = 11771552003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771552003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177155196 + ... + 1177155205.

It is an arithmetic number, because the mean of its divisors is an integer number (3531465603).

Almost surely, 2^11771552005 is an apocalyptic number.

It is an amenable number.

11771552005 is a deficient number, since it is larger than the sum of its proper divisors (2354310407).

11771552005 is an equidigital number, since it uses as much as digits as its factorization.

11771552005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354310406.

The product of its (nonzero) digits is 12250, while the sum is 34.

The spelling of 11771552005 in words is "eleven billion, seven hundred seventy-one million, five hundred fifty-two thousand, five".