643309629573907 has 2 divisors, whose sum is σ = 643309629573908. Its totient is φ = 643309629573906.

The previous prime is 643309629573839. The next prime is 643309629574019. The reversal of 643309629573907 is 709375926903346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643309629573907 - 2¹¹ = 643309629571859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643309629573907.

It is not a weakly prime, because it can be changed into another prime (643309629573607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321654814786953 + 321654814786954.

It is an arithmetic number, because the mean of its divisors is an integer number (321654814786954).

Almost surely, 2^{643309629573907} is an apocalyptic number.

643309629573907 is a deficient number, since it is larger than the sum of its proper divisors (1).

643309629573907 is an equidigital number, since it uses as much as digits as its factorization.

643309629573907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1388832480, while the sum is 73.

The spelling of 643309629573907 in words is "six hundred forty-three trillion, three hundred nine billion, six hundred twenty-nine million, five hundred seventy-three thousand, nine hundred seven".