665896066 has 16 divisors (see below), whose sum is σ = 1108118880. Its totient is φ = 297549280.

The previous prime is 665896061. The next prime is 665896073. The reversal of 665896066 is 660698566.

It is not an unprimeable number, because it can be changed into a prime (665896061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255211 + ... + 257806.

It is an arithmetic number, because the mean of its divisors is an integer number (69257430).

Almost surely, 2^665896066 is an apocalyptic number.

665896066 is a deficient number, since it is larger than the sum of its proper divisors (442222814).

665896066 is a wasteful number, since it uses less digits than its factorization.

665896066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513089.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The square root of 665896066 is about 25804.9620422120. The cubic root of 665896066 is about 873.2437441201.

The spelling of 665896066 in words is "six hundred sixty-five million, eight hundred ninety-six thousand, sixty-six".