66531011 has 2 divisors, whose sum is σ = 66531012. Its totient is φ = 66531010.

The previous prime is 66530999. The next prime is 66531029. The reversal of 66531011 is 11013566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66531011 - 2¹⁴ = 66514627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66531041) 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, 33265505 + 33265506.

It is an arithmetic number, because the mean of its divisors is an integer number (33265506).

Almost surely, 2^66531011 is an apocalyptic number.

66531011 is a deficient number, since it is larger than the sum of its proper divisors (1).

66531011 is an equidigital number, since it uses as much as digits as its factorization.

66531011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 66531011 is about 8156.6543999363. The cubic root of 66531011 is about 405.2049178924.

Adding to 66531011 its reverse (11013566), we get a palindrome (77544577).

The spelling of 66531011 in words is "sixty-six million, five hundred thirty-one thousand, eleven".