12777222809 has 24 divisors (see below), whose sum is σ = 14760820872. Its totient is φ = 10990183680.

The previous prime is 12777222793. The next prime is 12777222833. The reversal of 12777222809 is 90822277721.

It can be written as a sum of positive squares in 4 ways, for example, as 159643225 + 12617579584 = 12635^2 + 112328^2 .

It is not a de Polignac number, because 12777222809 - 2⁴ = 12777222793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12777222869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263957 + ... + 308589.

It is an arithmetic number, because the mean of its divisors is an integer number (615034203).

Almost surely, 2^12777222809 is an apocalyptic number.

12777222809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12777222809 is a deficient number, since it is larger than the sum of its proper divisors (1983598063).

12777222809 is a wasteful number, since it uses less digits than its factorization.

12777222809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44745 (or 44726 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 12777222809 in words is "twelve billion, seven hundred seventy-seven million, two hundred twenty-two thousand, eight hundred nine".