12643323765 has 32 divisors (see below), whose sum is σ = 20310466176. Its totient is φ = 6716117760.

The previous prime is 12643323751. The next prime is 12643323769. The reversal of 12643323765 is 56732334621.

It is not a de Polignac number, because 12643323765 - 2¹² = 12643319669 is a prime.

It is a super-2 number, since 2×12643323765² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643323769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4721607 + ... + 4724283.

It is an arithmetic number, because the mean of its divisors is an integer number (634702068).

Almost surely, 2^12643323765 is an apocalyptic number.

12643323765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12643323765 is a deficient number, since it is larger than the sum of its proper divisors (7667142411).

12643323765 is a wasteful number, since it uses less digits than its factorization.

12643323765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829.

The product of its digits is 544320, while the sum is 42.

The spelling of 12643323765 in words is "twelve billion, six hundred forty-three million, three hundred twenty-three thousand, seven hundred sixty-five".