12643055165 has 16 divisors (see below), whose sum is σ = 16421671728. Its totient is φ = 9289007616.

The previous prime is 12643055153. The next prime is 12643055171. The reversal of 12643055165 is 56155034621.

It can be written as a sum of positive squares in 8 ways, for example, as 59151481 + 12583903684 = 7691^2 + 112178^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643055165 - 2¹⁴ = 12643038781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480872 + ... + 506481.

It is an arithmetic number, because the mean of its divisors is an integer number (1026354483).

Almost surely, 2^12643055165 is an apocalyptic number.

It is an amenable number.

12643055165 is a deficient number, since it is larger than the sum of its proper divisors (3778616563).

12643055165 is a wasteful number, since it uses less digits than its factorization.

12643055165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987568.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 12643055165 its reverse (56155034621), we get a palindrome (68798089786).

The spelling of 12643055165 in words is "twelve billion, six hundred forty-three million, fifty-five thousand, one hundred sixty-five".