41664021857 has 2 divisors, whose sum is σ = 41664021858. Its totient is φ = 41664021856.

The previous prime is 41664021851. The next prime is 41664021859. The reversal of 41664021857 is 75812046614.

41664021857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31590085696 + 10073936161 = 177736^2 + 100369^2 .

It is a cyclic number.

It is not a de Polignac number, because 41664021857 - 2²⁰ = 41662973281 is a prime.

Together with 41664021859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (41664021851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20832010928 + 20832010929.

It is an arithmetic number, because the mean of its divisors is an integer number (20832010929).

Almost surely, 2^41664021857 is an apocalyptic number.

It is an amenable number.

41664021857 is a deficient number, since it is larger than the sum of its proper divisors (1).

41664021857 is an equidigital number, since it uses as much as digits as its factorization.

41664021857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 41664021857 in words is "forty-one billion, six hundred sixty-four million, twenty-one thousand, eight hundred fifty-seven".