641275197469 has 2 divisors, whose sum is σ = 641275197470. Its totient is φ = 641275197468.

The previous prime is 641275197427. The next prime is 641275197509. The reversal of 641275197469 is 964791572146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348094100025 + 293181097444 = 589995^2 + 541462^2 .

It is a cyclic number.

It is not a de Polignac number, because 641275197469 - 2⁹ = 641275196957 is a prime.

It is a super-2 number, since 2×641275197469² (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 (641275197169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320637598734 + 320637598735.

It is an arithmetic number, because the mean of its divisors is an integer number (320637598735).

Almost surely, 2^641275197469 is an apocalyptic number.

It is an amenable number.

641275197469 is a deficient number, since it is larger than the sum of its proper divisors (1).

641275197469 is an equidigital number, since it uses as much as digits as its factorization.

641275197469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 61.

The spelling of 641275197469 in words is "six hundred forty-one billion, two hundred seventy-five million, one hundred ninety-seven thousand, four hundred sixty-nine".