66397311 has 12 divisors (see below), whose sum is σ = 96321888. Its totient is φ = 44073504.

The previous prime is 66397301. The next prime is 66397313. The reversal of 66397311 is 11379366.

66397311 is a `hidden beast` number, since 6 + 639 + 7 + 3 + 11 = 666.

It is not a de Polignac number, because 66397311 - 2¹⁰ = 66396287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66397313) 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 in 11 ways as a sum of consecutive naturals, for example, 13735 + ... + 17928.

It is an arithmetic number, because the mean of its divisors is an integer number (8026824).

Almost surely, 2^66397311 is an apocalyptic number.

66397311 is a deficient number, since it is larger than the sum of its proper divisors (29924577).

66397311 is a wasteful number, since it uses less digits than its factorization.

66397311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31902 (or 31899 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 66397311 is about 8148.4545160417. The cubic root of 66397311 is about 404.9333040605.

The spelling of 66397311 in words is "sixty-six million, three hundred ninety-seven thousand, three hundred eleven".