12785055281 has 4 divisors (see below), whose sum is σ = 13082382192. Its totient is φ = 12487728372.

The previous prime is 12785055277. The next prime is 12785055289. The reversal of 12785055281 is 18255058721.

It is a happy number.

12785055281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18255058721 = 67 ⋅272463563.

It is a cyclic number.

It is not a de Polignac number, because 12785055281 - 2² = 12785055277 is a prime.

It is a super-2 number, since 2×12785055281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12785055289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148663391 + ... + 148663476.

It is an arithmetic number, because the mean of its divisors is an integer number (3270595548).

Almost surely, 2^12785055281 is an apocalyptic number.

It is an amenable number.

12785055281 is a deficient number, since it is larger than the sum of its proper divisors (297326911).

12785055281 is an equidigital number, since it uses as much as digits as its factorization.

12785055281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297326910.

The product of its (nonzero) digits is 224000, while the sum is 44.

The spelling of 12785055281 in words is "twelve billion, seven hundred eighty-five million, fifty-five thousand, two hundred eighty-one".