660065697 has 24 divisors (see below), whose sum is σ = 983813376. Its totient is φ = 426214656.

The previous prime is 660065669. The next prime is 660065701. The reversal of 660065697 is 796560066.

It is a de Polignac number, because none of the positive numbers 2^k-660065697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660064697) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 32988 + ... + 49074.

It is an arithmetic number, because the mean of its divisors is an integer number (40992224).

Almost surely, 2^660065697 is an apocalyptic number.

It is an amenable number.

660065697 is a deficient number, since it is larger than the sum of its proper divisors (323747679).

660065697 is a wasteful number, since it uses less digits than its factorization.

660065697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16237 (or 16234 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 660065697 is about 25691.7437516413. The cubic root of 660065697 is about 870.6876568807.

The spelling of 660065697 in words is "six hundred sixty million, sixty-five thousand, six hundred ninety-seven".