66380843443 has 2 divisors, whose sum is σ = 66380843444. Its totient is φ = 66380843442.

The previous prime is 66380843423. The next prime is 66380843497. The reversal of 66380843443 is 34434808366.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66380843443 is a prime.

It is not a weakly prime, because it can be changed into another prime (66380843423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33190421721 + 33190421722.

It is an arithmetic number, because the mean of its divisors is an integer number (33190421722).

Almost surely, 2^66380843443 is an apocalyptic number.

66380843443 is a deficient number, since it is larger than the sum of its proper divisors (1).

66380843443 is an equidigital number, since it uses as much as digits as its factorization.

66380843443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3981312, while the sum is 49.

The spelling of 66380843443 in words is "sixty-six billion, three hundred eighty million, eight hundred forty-three thousand, four hundred forty-three".