66443407 has 2 divisors, whose sum is σ = 66443408. Its totient is φ = 66443406.

The previous prime is 66443393. The next prime is 66443413. The reversal of 66443407 is 70434466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66443407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66443467) 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, 33221703 + 33221704.

It is an arithmetic number, because the mean of its divisors is an integer number (33221704).

Almost surely, 2^66443407 is an apocalyptic number.

66443407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66443407 is an equidigital number, since it uses as much as digits as its factorization.

66443407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 66443407 is about 8151.2825371226. The cubic root of 66443407 is about 405.0269900216.

The spelling of 66443407 in words is "sixty-six million, four hundred forty-three thousand, four hundred seven".