1643298521983 has 2 divisors, whose sum is σ = 1643298521984. Its totient is φ = 1643298521982.

The previous prime is 1643298521941. The next prime is 1643298521987. The reversal of 1643298521983 is 3891258923461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643298521983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643298521987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821649260991 + 821649260992.

It is an arithmetic number, because the mean of its divisors is an integer number (821649260992).

Almost surely, 2^{1643298521983} is an apocalyptic number.

1643298521983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643298521983 is an equidigital number, since it uses as much as digits as its factorization.

1643298521983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 61.

The spelling of 1643298521983 in words is "one trillion, six hundred forty-three billion, two hundred ninety-eight million, five hundred twenty-one thousand, nine hundred eighty-three".