66543011 has 2 divisors, whose sum is σ = 66543012. Its totient is φ = 66543010.

The previous prime is 66542951. The next prime is 66543017. The reversal of 66543011 is 11034566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66543011 - 2¹⁰ = 66541987 is a prime.

It is a super-2 number, since 2×66543011² = 8855944625892242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66543017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271505 + 33271506.

It is an arithmetic number, because the mean of its divisors is an integer number (33271506).

Almost surely, 2^66543011 is an apocalyptic number.

66543011 is a deficient number, since it is larger than the sum of its proper divisors (1).

66543011 is an equidigital number, since it uses as much as digits as its factorization.

66543011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66543011 is about 8157.3899624819. The cubic root of 66543011 is about 405.2292782953.

Adding to 66543011 its reverse (11034566), we get a palindrome (77577577).

The spelling of 66543011 in words is "sixty-six million, five hundred forty-three thousand, eleven".