66500011 has 2 divisors, whose sum is σ = 66500012. Its totient is φ = 66500010.

The previous prime is 66500009. The next prime is 66500017. The reversal of 66500011 is 11000566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66500011 - 2¹ = 66500009 is a prime.

Together with 66500009, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66500017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250005 + 33250006.

It is an arithmetic number, because the mean of its divisors is an integer number (33250006).

Almost surely, 2^66500011 is an apocalyptic number.

66500011 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500011 is an equidigital number, since it uses as much as digits as its factorization.

66500011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 66500011 is about 8154.7538896033. The cubic root of 66500011 is about 405.1419732908.

Adding to 66500011 its reverse (11000566), we get a palindrome (77500577).

The spelling of 66500011 in words is "sixty-six million, five hundred thousand, eleven".