66544003 has 2 divisors, whose sum is σ = 66544004. Its totient is φ = 66544002.

The previous prime is 66543977. The next prime is 66544013. The reversal of 66544003 is 30044566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66544003 is a prime.

It is not a weakly prime, because it can be changed into another prime (66544013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33272001 + 33272002.

It is an arithmetic number, because the mean of its divisors is an integer number (33272002).

Almost surely, 2^66544003 is an apocalyptic number.

66544003 is a deficient number, since it is larger than the sum of its proper divisors (1).

66544003 is an equidigital number, since it uses as much as digits as its factorization.

66544003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66544003 is about 8157.4507660175. The cubic root of 66544003 is about 405.2312919576.

Adding to 66544003 its reverse (30044566), we get a palindrome (96588569).

The spelling of 66544003 in words is "sixty-six million, five hundred forty-four thousand, three".