1643245121071 has 2 divisors, whose sum is σ = 1643245121072. Its totient is φ = 1643245121070.

The previous prime is 1643245120997. The next prime is 1643245121083. The reversal of 1643245121071 is 1701215423461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1643245121071 - 2²³ = 1643236732463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643245121071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643245721071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821622560535 + 821622560536.

It is an arithmetic number, because the mean of its divisors is an integer number (821622560536).

Almost surely, 2^{1643245121071} is an apocalyptic number.

1643245121071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643245121071 is an equidigital number, since it uses as much as digits as its factorization.

1643245121071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 1643245121071 in words is "one trillion, six hundred forty-three billion, two hundred forty-five million, one hundred twenty-one thousand, seventy-one".