66543203 has 2 divisors, whose sum is σ = 66543204. Its totient is φ = 66543202.

The previous prime is 66543199. The next prime is 66543221. The reversal of 66543203 is 30234566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66543203 - 2² = 66543199 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66543293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271601 + 33271602.

It is an arithmetic number, because the mean of its divisors is an integer number (33271602).

Almost surely, 2^66543203 is an apocalyptic number.

66543203 is a deficient number, since it is larger than the sum of its proper divisors (1).

66543203 is an equidigital number, since it uses as much as digits as its factorization.

66543203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 66543203 is about 8157.4017309435. The cubic root of 66543203 is about 405.2296680380.

Adding to 66543203 its reverse (30234566), we get a palindrome (96777769).

The spelling of 66543203 in words is "sixty-six million, five hundred forty-three thousand, two hundred three".