643212424212349 has 2 divisors, whose sum is σ = 643212424212350. Its totient is φ = 643212424212348.

The previous prime is 643212424212343. The next prime is 643212424212353. The reversal of 643212424212349 is 943212424212346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352406080440324 + 290806343772025 = 18772482^2 + 17053045^2 .

It is a cyclic number.

It is not a de Polignac number, because 643212424212349 - 2⁵ = 643212424212317 is a prime.

It is a super-3 number, since 3×643212424212349³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643212424212343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321606212106174 + 321606212106175.

It is an arithmetic number, because the mean of its divisors is an integer number (321606212106175).

Almost surely, 2^{643212424212349} is an apocalyptic number.

It is an amenable number.

643212424212349 is a deficient number, since it is larger than the sum of its proper divisors (1).

643212424212349 is an equidigital number, since it uses as much as digits as its factorization.

643212424212349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 49.

The spelling of 643212424212349 in words is "six hundred forty-three trillion, two hundred twelve billion, four hundred twenty-four million, two hundred twelve thousand, three hundred forty-nine".