12782246161 has 16 divisors (see below), whose sum is σ = 14051532240. Its totient is φ = 11573452800.

The previous prime is 12782246153. The next prime is 12782246171. The reversal of 12782246161 is 16164228721.

12782246161 = 79944² + 79945².

12782246161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1083660561 + 11698585600 = 32919^2 + 108160^2 .

It is a cyclic number.

It is not a de Polignac number, because 12782246161 - 2³ = 12782246153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12782246171) 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 15 ways as a sum of consecutive naturals, for example, 89761 + ... + 183361.

It is an arithmetic number, because the mean of its divisors is an integer number (878220765).

Almost surely, 2^12782246161 is an apocalyptic number.

12782246161 is the 79945-th centered square number.

It is an amenable number.

12782246161 is a deficient number, since it is larger than the sum of its proper divisors (1269286079).

12782246161 is a wasteful number, since it uses less digits than its factorization.

12782246161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93924.

The product of its digits is 64512, while the sum is 40.

The spelling of 12782246161 in words is "twelve billion, seven hundred eighty-two million, two hundred forty-six thousand, one hundred sixty-one".