643314620101 has 2 divisors, whose sum is σ = 643314620102. Its totient is φ = 643314620100.

The previous prime is 643314620099. The next prime is 643314620149. The reversal of 643314620101 is 101026413346.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382833000225 + 260481619876 = 618735^2 + 510374^2 .

It is a cyclic number.

It is not a de Polignac number, because 643314620101 - 2¹ = 643314620099 is a prime.

Together with 643314620099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643384620101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321657310050 + 321657310051.

It is an arithmetic number, because the mean of its divisors is an integer number (321657310051).

Almost surely, 2^643314620101 is an apocalyptic number.

It is an amenable number.

643314620101 is a deficient number, since it is larger than the sum of its proper divisors (1).

643314620101 is an equidigital number, since it uses as much as digits as its factorization.

643314620101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 643314620101 in words is "six hundred forty-three billion, three hundred fourteen million, six hundred twenty thousand, one hundred one".