641791723481 has 2 divisors, whose sum is σ = 641791723482. Its totient is φ = 641791723480.

The previous prime is 641791723427. The next prime is 641791723501. The reversal of 641791723481 is 184327197146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409964881225 + 231826842256 = 640285^2 + 481484^2 .

It is a cyclic number.

It is not a de Polignac number, because 641791723481 - 2³⁴ = 624611854297 is a prime.

It is a super-2 number, since 2×641791723481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641791723681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320895861740 + 320895861741.

It is an arithmetic number, because the mean of its divisors is an integer number (320895861741).

Almost surely, 2^641791723481 is an apocalyptic number.

It is an amenable number.

641791723481 is a deficient number, since it is larger than the sum of its proper divisors (1).

641791723481 is an equidigital number, since it uses as much as digits as its factorization.

641791723481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The spelling of 641791723481 in words is "six hundred forty-one billion, seven hundred ninety-one million, seven hundred twenty-three thousand, four hundred eighty-one".