641791560457 has 2 divisors, whose sum is σ = 641791560458. Its totient is φ = 641791560456.

The previous prime is 641791560451. The next prime is 641791560499. The reversal of 641791560457 is 754065197146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398036071801 + 243755488656 = 630901^2 + 493716^2 .

It is a cyclic number.

It is not a de Polignac number, because 641791560457 - 2³⁵ = 607431822089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641791560398 and 641791560407.

It is not a weakly prime, because it can be changed into another prime (641791560451) 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, 320895780228 + 320895780229.

It is an arithmetic number, because the mean of its divisors is an integer number (320895780229).

Almost surely, 2^641791560457 is an apocalyptic number.

It is an amenable number.

641791560457 is a deficient number, since it is larger than the sum of its proper divisors (1).

641791560457 is an equidigital number, since it uses as much as digits as its factorization.

641791560457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 641791560457 in words is "six hundred forty-one billion, seven hundred ninety-one million, five hundred sixty thousand, four hundred fifty-seven".