66744443 has 2 divisors, whose sum is σ = 66744444. Its totient is φ = 66744442.

The previous prime is 66744427. The next prime is 66744463. The reversal of 66744443 is 34444766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66744443 - 2⁴ = 66744427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66744397 and 66744406.

It is not a weakly prime, because it can be changed into another prime (66744463) 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, 33372221 + 33372222.

It is an arithmetic number, because the mean of its divisors is an integer number (33372222).

Almost surely, 2^66744443 is an apocalyptic number.

66744443 is a deficient number, since it is larger than the sum of its proper divisors (1).

66744443 is an equidigital number, since it uses as much as digits as its factorization.

66744443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 38.

The square root of 66744443 is about 8169.7272292286. The cubic root of 66744443 is about 405.6377555475.

The spelling of 66744443 in words is "sixty-six million, seven hundred forty-four thousand, four hundred forty-three".