1643163860843 has 2 divisors, whose sum is σ = 1643163860844. Its totient is φ = 1643163860842.

The previous prime is 1643163860837. The next prime is 1643163860861. The reversal of 1643163860843 is 3480683613461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1643163860843 - 2³² = 1638868893547 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643163860803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821581930421 + 821581930422.

It is an arithmetic number, because the mean of its divisors is an integer number (821581930422).

Almost surely, 2^{1643163860843} is an apocalyptic number.

1643163860843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643163860843 is an equidigital number, since it uses as much as digits as its factorization.

1643163860843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 53.

The spelling of 1643163860843 in words is "one trillion, six hundred forty-three billion, one hundred sixty-three million, eight hundred sixty thousand, eight hundred forty-three".