643505626333 has 2 divisors, whose sum is σ = 643505626334. Its totient is φ = 643505626332.

The previous prime is 643505626303. The next prime is 643505626349. The reversal of 643505626333 is 333626505346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611456749849 + 32048876484 = 781957^2 + 179022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643505626333 is a prime.

It is a super-2 number, since 2×643505626333² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643505626303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321752813166 + 321752813167.

It is an arithmetic number, because the mean of its divisors is an integer number (321752813167).

Almost surely, 2^643505626333 is an apocalyptic number.

It is an amenable number.

643505626333 is a deficient number, since it is larger than the sum of its proper divisors (1).

643505626333 is an equidigital number, since it uses as much as digits as its factorization.

643505626333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 46.

The spelling of 643505626333 in words is "six hundred forty-three billion, five hundred five million, six hundred twenty-six thousand, three hundred thirty-three".