1223783307865 has 4 divisors (see below), whose sum is σ = 1468539969444. Its totient is φ = 979026646288.

The previous prime is 1223783307853. The next prime is 1223783307881. The reversal of 1223783307865 is 5687033873221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 399252114496 + 824531193369 = 631864^2 + 908037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223783307865 - 2⁹ = 1223783307353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122378330782 + ... + 122378330791.

It is an arithmetic number, because the mean of its divisors is an integer number (367134992361).

Almost surely, 2^{1223783307865} is an apocalyptic number.

It is an amenable number.

1223783307865 is a deficient number, since it is larger than the sum of its proper divisors (244756661579).

1223783307865 is an equidigital number, since it uses as much as digits as its factorization.

1223783307865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244756661578.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 1223783307865 in words is "one trillion, two hundred twenty-three billion, seven hundred eighty-three million, three hundred seven thousand, eight hundred sixty-five".