643245704683 has 2 divisors, whose sum is σ = 643245704684. Its totient is φ = 643245704682.

The previous prime is 643245704657. The next prime is 643245704819. The reversal of 643245704683 is 386407542346.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643245704683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643245704683.

It is not a weakly prime, because it can be changed into another prime (643245708683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321622852341 + 321622852342.

It is an arithmetic number, because the mean of its divisors is an integer number (321622852342).

Almost surely, 2^643245704683 is an apocalyptic number.

643245704683 is a deficient number, since it is larger than the sum of its proper divisors (1).

643245704683 is an equidigital number, since it uses as much as digits as its factorization.

643245704683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 52.

The spelling of 643245704683 in words is "six hundred forty-three billion, two hundred forty-five million, seven hundred four thousand, six hundred eighty-three".