641095066691 has 2 divisors, whose sum is σ = 641095066692. Its totient is φ = 641095066690.

The previous prime is 641095066663. The next prime is 641095066693. The reversal of 641095066691 is 196660590146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641095066691 - 2³⁸ = 366217159747 is a prime.

It is a super-2 number, since 2×641095066691² (a number of 24 digits) contains 22 as substring.

Together with 641095066693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641095066693) 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, 320547533345 + 320547533346.

It is an arithmetic number, because the mean of its divisors is an integer number (320547533346).

Almost surely, 2^641095066691 is an apocalyptic number.

641095066691 is a deficient number, since it is larger than the sum of its proper divisors (1).

641095066691 is an equidigital number, since it uses as much as digits as its factorization.

641095066691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 641095066691 in words is "six hundred forty-one billion, ninety-five million, sixty-six thousand, six hundred ninety-one".