12783270665 has 24 divisors (see below), whose sum is σ = 16984424520. Its totient is φ = 9229003520.

The previous prime is 12783270629. The next prime is 12783270679. The reversal of 12783270665 is 56607238721.

It can be written as a sum of positive squares in 4 ways, for example, as 2668342336 + 10114928329 = 51656^2 + 100573^2 .

It is not a de Polignac number, because 12783270665 - 2¹⁶ = 12783205129 is a prime.

It is an unprimeable number.

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, 5771 + ... + 159999.

It is an arithmetic number, because the mean of its divisors is an integer number (707684355).

Almost surely, 2^12783270665 is an apocalyptic number.

It is an amenable number.

12783270665 is a deficient number, since it is larger than the sum of its proper divisors (4201153855).

12783270665 is a wasteful number, since it uses less digits than its factorization.

12783270665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154393 (or 154382 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 12783270665 in words is "twelve billion, seven hundred eighty-three million, two hundred seventy thousand, six hundred sixty-five".