12008005771 has 4 divisors (see below), whose sum is σ = 12120230232. Its totient is φ = 11895781312.

The previous prime is 12008005729. The next prime is 12008005781. The reversal of 12008005771 is 17750080021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17750080021 = 41 ⋅432928781.

It is a cyclic number.

It is not a de Polignac number, because 12008005771 - 2¹⁹ = 12007481483 is a prime.

It is a Smith number, since the sum of its digits (31) 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 not an unprimeable number, because it can be changed into a prime (12008005781) 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, 56112070 + ... + 56112283.

It is an arithmetic number, because the mean of its divisors is an integer number (3030057558).

Almost surely, 2^12008005771 is an apocalyptic number.

12008005771 is a deficient number, since it is larger than the sum of its proper divisors (112224461).

12008005771 is a wasteful number, since it uses less digits than its factorization.

12008005771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112224460.

The product of its (nonzero) digits is 3920, while the sum is 31.

Adding to 12008005771 its reverse (17750080021), we get a palindrome (29758085792).

The spelling of 12008005771 in words is "twelve billion, eight million, five thousand, seven hundred seventy-one".