643073448371 has 2 divisors, whose sum is σ = 643073448372. Its totient is φ = 643073448370.

The previous prime is 643073448341. The next prime is 643073448421. The reversal of 643073448371 is 173844370346.

643073448371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (643073448421) can be obtained adding 643073448371 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643073448371 is a prime.

It is not a weakly prime, because it can be changed into another prime (643073448301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321536724185 + 321536724186.

It is an arithmetic number, because the mean of its divisors is an integer number (321536724186).

Almost surely, 2^643073448371 is an apocalyptic number.

643073448371 is a deficient number, since it is larger than the sum of its proper divisors (1).

643073448371 is an equidigital number, since it uses as much as digits as its factorization.

643073448371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 50.

The spelling of 643073448371 in words is "six hundred forty-three billion, seventy-three million, four hundred forty-eight thousand, three hundred seventy-one".