665768066 has 16 divisors (see below), whose sum is σ = 1032200064. Its totient is φ = 321872304.

The previous prime is 665768057. The next prime is 665768071. The reversal of 665768066 is 660867566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34865 + ... + 50468.

It is an arithmetic number, because the mean of its divisors is an integer number (64512504).

Almost surely, 2^665768066 is an apocalyptic number.

665768066 is a deficient number, since it is larger than the sum of its proper divisors (366431998).

665768066 is a wasteful number, since it uses less digits than its factorization.

665768066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85465.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 665768066 is about 25802.4817798599. The cubic root of 665768066 is about 873.1877882597.

The spelling of 665768066 in words is "six hundred sixty-five million, seven hundred sixty-eight thousand, sixty-six".