66042543839 has 2 divisors, whose sum is σ = 66042543840. Its totient is φ = 66042543838.

The previous prime is 66042543779. The next prime is 66042543841. The reversal of 66042543839 is 93834524066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66042543839 - 2¹⁶ = 66042478303 is a prime.

It is a Sophie Germain prime.

Together with 66042543841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66042543439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33021271919 + 33021271920.

It is an arithmetic number, because the mean of its divisors is an integer number (33021271920).

Almost surely, 2^66042543839 is an apocalyptic number.

66042543839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66042543839 is an equidigital number, since it uses as much as digits as its factorization.

66042543839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 66042543839 in words is "sixty-six billion, forty-two million, five hundred forty-three thousand, eight hundred thirty-nine".