641095066693 has 2 divisors, whose sum is σ = 641095066694. Its totient is φ = 641095066692.

The previous prime is 641095066691. The next prime is 641095066697. The reversal of 641095066693 is 396660590146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497338069284 + 143756997409 = 705222^2 + 379153^2 .

It is a cyclic number.

It is not a de Polignac number, because 641095066693 - 2¹ = 641095066691 is a prime.

It is a super-3 number, since 3×641095066693³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 641095066691, 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 (641095066691) 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, 320547533346 + 320547533347.

It is an arithmetic number, because the mean of its divisors is an integer number (320547533347).

Almost surely, 2^641095066693 is an apocalyptic number.

It is an amenable number.

641095066693 is a deficient number, since it is larger than the sum of its proper divisors (1).

641095066693 is an equidigital number, since it uses as much as digits as its factorization.

641095066693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6298560, while the sum is 55.

The spelling of 641095066693 in words is "six hundred forty-one billion, ninety-five million, sixty-six thousand, six hundred ninety-three".