641275662493 has 2 divisors, whose sum is σ = 641275662494. Its totient is φ = 641275662492.

The previous prime is 641275662487. The next prime is 641275662523. The reversal of 641275662493 is 394266572146.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475876466244 + 165399196249 = 689838^2 + 406693^2 .

It is a cyclic number.

It is not a de Polignac number, because 641275662493 - 2³³ = 632685727901 is a prime.

It is a super-2 number, since 2×641275662493² (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 (641275662403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320637831246 + 320637831247.

It is an arithmetic number, because the mean of its divisors is an integer number (320637831247).

Almost surely, 2^641275662493 is an apocalyptic number.

It is an amenable number.

641275662493 is a deficient number, since it is larger than the sum of its proper divisors (1).

641275662493 is an equidigital number, since it uses as much as digits as its factorization.

641275662493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 55.

The spelling of 641275662493 in words is "six hundred forty-one billion, two hundred seventy-five million, six hundred sixty-two thousand, four hundred ninety-three".