1643740473433 has 2 divisors, whose sum is σ = 1643740473434. Its totient is φ = 1643740473432.

The previous prime is 1643740473359. The next prime is 1643740473497. The reversal of 1643740473433 is 3343740473461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1510313186704 + 133427286729 = 1228948^2 + 365277^2 .

It is an emirp because it is prime and its reverse (3343740473461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643740473433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643740473833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821870236716 + 821870236717.

It is an arithmetic number, because the mean of its divisors is an integer number (821870236717).

Almost surely, 2^{1643740473433} is an apocalyptic number.

It is an amenable number.

1643740473433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643740473433 is an equidigital number, since it uses as much as digits as its factorization.

1643740473433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 49.

The spelling of 1643740473433 in words is "one trillion, six hundred forty-three billion, seven hundred forty million, four hundred seventy-three thousand, four hundred thirty-three".