66804364373 has 2 divisors, whose sum is σ = 66804364374. Its totient is φ = 66804364372.

The previous prime is 66804364351. The next prime is 66804364387. The reversal of 66804364373 is 37346340866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39874897969 + 26929466404 = 199687^2 + 164102^2 .

It is a cyclic number.

It is not a de Polignac number, because 66804364373 - 2⁶ = 66804364309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66804364303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33402182186 + 33402182187.

It is an arithmetic number, because the mean of its divisors is an integer number (33402182187).

Almost surely, 2^66804364373 is an apocalyptic number.

It is an amenable number.

66804364373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66804364373 is an equidigital number, since it uses as much as digits as its factorization.

66804364373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 50.

The spelling of 66804364373 in words is "sixty-six billion, eight hundred four million, three hundred sixty-four thousand, three hundred seventy-three".