65945666 has 8 divisors (see below), whose sum is σ = 98952960. Its totient is φ = 32961348.

The previous prime is 65945651. The next prime is 65945689. The reversal of 65945666 is 66654956.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 65945666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8375 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (12369120).

Almost surely, 2^65945666 is an apocalyptic number.

65945666 is a deficient number, since it is larger than the sum of its proper divisors (33007294).

65945666 is a wasteful number, since it uses less digits than its factorization.

65945666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11488.

The product of its digits is 1166400, while the sum is 47.

The square root of 65945666 is about 8120.6936895810. The cubic root of 65945666 is about 404.0130742754.

The spelling of 65945666 in words is "sixty-five million, nine hundred forty-five thousand, six hundred sixty-six".