12776671405 has 4 divisors (see below), whose sum is σ = 15332005692. Its totient is φ = 10221337120.

The previous prime is 12776671403. The next prime is 12776671423. The reversal of 12776671405 is 50417667721.

12776671405 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6436371529 + 6340299876 = 80227^2 + 79626^2 .

It is not a de Polignac number, because 12776671405 - 2¹ = 12776671403 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 (12776671403) 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, 1277667136 + ... + 1277667145.

It is an arithmetic number, because the mean of its divisors is an integer number (3833001423).

Almost surely, 2^12776671405 is an apocalyptic number.

It is an amenable number.

12776671405 is a deficient number, since it is larger than the sum of its proper divisors (2555334287).

12776671405 is an equidigital number, since it uses as much as digits as its factorization.

12776671405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555334286.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 12776671405 in words is "twelve billion, seven hundred seventy-six million, six hundred seventy-one thousand, four hundred five".