1643089849663 has 2 divisors, whose sum is σ = 1643089849664. Its totient is φ = 1643089849662.

The previous prime is 1643089849631. The next prime is 1643089849693. The reversal of 1643089849663 is 3669489803461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1643089849663 - 2⁵ = 1643089849631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643089849693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821544924831 + 821544924832.

It is an arithmetic number, because the mean of its divisors is an integer number (821544924832).

Almost surely, 2^{1643089849663} is an apocalyptic number.

1643089849663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643089849663 is an equidigital number, since it uses as much as digits as its factorization.

1643089849663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161243136, while the sum is 67.

The spelling of 1643089849663 in words is "one trillion, six hundred forty-three billion, eighty-nine million, eight hundred forty-nine thousand, six hundred sixty-three".