660516665 has 8 divisors (see below), whose sum is σ = 834336960. Its totient is φ = 500602032.

The previous prime is 660516641. The next prime is 660516677. The reversal of 660516665 is 566615066.

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 660516665 - 2²² = 656322361 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3476309 + ... + 3476498.

It is an arithmetic number, because the mean of its divisors is an integer number (104292120).

Almost surely, 2^660516665 is an apocalyptic number.

It is an amenable number.

660516665 is a deficient number, since it is larger than the sum of its proper divisors (173820295).

660516665 is a wasteful number, since it uses less digits than its factorization.

660516665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6952831.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 660516665 is about 25700.5187690832. The cubic root of 660516665 is about 870.8859012296.

The spelling of 660516665 in words is "six hundred sixty million, five hundred sixteen thousand, six hundred sixty-five".