660510065 has 4 divisors (see below), whose sum is σ = 792612084. Its totient is φ = 528408048.

The previous prime is 660510049. The next prime is 660510077. The reversal of 660510065 is 560015066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382554481 + 277955584 = 19559^2 + 16672^2 .

It is a cyclic number.

It is not a de Polignac number, because 660510065 - 2⁴ = 660510049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66051002 + ... + 66051011.

It is an arithmetic number, because the mean of its divisors is an integer number (198153021).

Almost surely, 2^660510065 is an apocalyptic number.

It is an amenable number.

660510065 is a deficient number, since it is larger than the sum of its proper divisors (132102019).

660510065 is a wasteful number, since it uses less digits than its factorization.

660510065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132102018.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 660510065 is about 25700.3903666851. The cubic root of 660510065 is about 870.8830005376.

The spelling of 660510065 in words is "six hundred sixty million, five hundred ten thousand, sixty-five".