643221360283 has 2 divisors, whose sum is σ = 643221360284. Its totient is φ = 643221360282.

The previous prime is 643221360281. The next prime is 643221360317. The reversal of 643221360283 is 382063122346.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643221360283 - 2¹ = 643221360281 is a prime.

Together with 643221360281, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (643221360281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321610680141 + 321610680142.

It is an arithmetic number, because the mean of its divisors is an integer number (321610680142).

Almost surely, 2^643221360283 is an apocalyptic number.

643221360283 is a deficient number, since it is larger than the sum of its proper divisors (1).

643221360283 is an equidigital number, since it uses as much as digits as its factorization.

643221360283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 643221360283 in words is "six hundred forty-three billion, two hundred twenty-one million, three hundred sixty thousand, two hundred eighty-three".