4243439406643 has 2 divisors, whose sum is σ = 4243439406644. Its totient is φ = 4243439406642.

The previous prime is 4243439406637. The next prime is 4243439406653. The reversal of 4243439406643 is 3466049343424.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243439406643 is a prime.

It is not a weakly prime, because it can be changed into another prime (4243439406653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121719703321 + 2121719703322.

It is an arithmetic number, because the mean of its divisors is an integer number (2121719703322).

Almost surely, 2^{4243439406643} is an apocalyptic number.

4243439406643 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243439406643 is an equidigital number, since it uses as much as digits as its factorization.

4243439406643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17915904, while the sum is 52.

The spelling of 4243439406643 in words is "four trillion, two hundred forty-three billion, four hundred thirty-nine million, four hundred six thousand, six hundred forty-three".