41664741721 has 2 divisors, whose sum is σ = 41664741722. Its totient is φ = 41664741720.

The previous prime is 41664741689. The next prime is 41664741787. The reversal of 41664741721 is 12714746614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40747863321 + 916878400 = 201861^2 + 30280^2 .

It is a cyclic number.

It is not a de Polignac number, because 41664741721 - 2⁵ = 41664741689 is a prime.

It is not a weakly prime, because it can be changed into another prime (41664741821) 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, 20832370860 + 20832370861.

It is an arithmetic number, because the mean of its divisors is an integer number (20832370861).

Almost surely, 2^41664741721 is an apocalyptic number.

It is an amenable number.

41664741721 is a deficient number, since it is larger than the sum of its proper divisors (1).

41664741721 is an equidigital number, since it uses as much as digits as its factorization.

41664741721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The spelling of 41664741721 in words is "forty-one billion, six hundred sixty-four million, seven hundred forty-one thousand, seven hundred twenty-one".