66506311 has 2 divisors, whose sum is σ = 66506312. Its totient is φ = 66506310.

The previous prime is 66506303. The next prime is 66506333. The reversal of 66506311 is 11360566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66506311 - 2³ = 66506303 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66506311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66506351) 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, 33253155 + 33253156.

It is an arithmetic number, because the mean of its divisors is an integer number (33253156).

Almost surely, 2^66506311 is an apocalyptic number.

66506311 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506311 is an equidigital number, since it uses as much as digits as its factorization.

66506311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66506311 is about 8155.1401582070. The cubic root of 66506311 is about 405.1547668418.

Adding to 66506311 its reverse (11360566), we get a palindrome (77866877).

The spelling of 66506311 in words is "sixty-six million, five hundred six thousand, three hundred eleven".