643245708683 has 2 divisors, whose sum is σ = 643245708684. Its totient is φ = 643245708682.

The previous prime is 643245708653. The next prime is 643245708689. The reversal of 643245708683 is 386807542346.

643245708683 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643245708683 is a prime.

It is not a weakly prime, because it can be changed into another prime (643245708689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321622854341 + 321622854342.

It is an arithmetic number, because the mean of its divisors is an integer number (321622854342).

Almost surely, 2^643245708683 is an apocalyptic number.

643245708683 is a deficient number, since it is larger than the sum of its proper divisors (1).

643245708683 is an equidigital number, since it uses as much as digits as its factorization.

643245708683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 643245708683 in words is "six hundred forty-three billion, two hundred forty-five million, seven hundred eight thousand, six hundred eighty-three".