666656065 has 8 divisors (see below), whose sum is σ = 800167680. Its totient is φ = 533204592.

The previous prime is 666656057. The next prime is 666656113. The reversal of 666656065 is 560656666.

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

It is a cyclic number.

It is not a de Polignac number, because 666656065 - 2³ = 666656057 is a prime.

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, 14706 + ... + 39364.

It is an arithmetic number, because the mean of its divisors is an integer number (100020960).

Almost surely, 2^666656065 is an apocalyptic number.

It is an amenable number.

666656065 is a deficient number, since it is larger than the sum of its proper divisors (133511615).

666656065 is a wasteful number, since it uses less digits than its factorization.

666656065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30071.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The square root of 666656065 is about 25819.6836735077. The cubic root of 666656065 is about 873.5758340073.

The spelling of 666656065 in words is "six hundred sixty-six million, six hundred fifty-six thousand, sixty-five".