66395866 has 16 divisors (see below), whose sum is σ = 103011840. Its totient is φ = 32076720.

The previous prime is 66395839. The next prime is 66395867. The reversal of 66395866 is 66859366.

It is a super-2 number, since 2×66395866² = 8816822043779912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66395867) 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 7 ways as a sum of consecutive naturals, for example, 2956 + ... + 11896.

It is an arithmetic number, because the mean of its divisors is an integer number (6438240).

Almost surely, 2^66395866 is an apocalyptic number.

66395866 is a deficient number, since it is larger than the sum of its proper divisors (36615974).

66395866 is a wasteful number, since it uses less digits than its factorization.

66395866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069.

The product of its digits is 1399680, while the sum is 49.

The square root of 66395866 is about 8148.3658484386. The cubic root of 66395866 is about 404.9303665275.

The spelling of 66395866 in words is "sixty-six million, three hundred ninety-five thousand, eight hundred sixty-six".