7843805643413 has 2 divisors, whose sum is σ = 7843805643414. Its totient is φ = 7843805643412.

The previous prime is 7843805643397. The next prime is 7843805643463. The reversal of 7843805643413 is 3143465083487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4086632057764 + 3757173585649 = 2021542^2 + 1938343^2 .

It is a cyclic number.

It is not a de Polignac number, because 7843805643413 - 2⁴ = 7843805643397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7843805643463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3921902821706 + 3921902821707.

It is an arithmetic number, because the mean of its divisors is an integer number (3921902821707).

Almost surely, 2^{7843805643413} is an apocalyptic number.

It is an amenable number.

7843805643413 is a deficient number, since it is larger than the sum of its proper divisors (1).

7843805643413 is an equidigital number, since it uses as much as digits as its factorization.

7843805643413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 7843805643413 in words is "seven trillion, eight hundred forty-three billion, eight hundred five million, six hundred forty-three thousand, four hundred thirteen".