660716017 has 4 divisors (see below), whose sum is σ = 711540340. Its totient is φ = 609891696.

The previous prime is 660715997. The next prime is 660716041. The reversal of 660716017 is 710617066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710617066 = 2 ⋅355308533.

It can be written as a sum of positive squares in 2 ways, for example, as 52403121 + 608312896 = 7239^2 + 24664^2 .

It is a cyclic number.

It is not a de Polignac number, because 660716017 - 2⁷ = 660715889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660716717) 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 3 ways as a sum of consecutive naturals, for example, 25412142 + ... + 25412167.

It is an arithmetic number, because the mean of its divisors is an integer number (177885085).

Almost surely, 2^660716017 is an apocalyptic number.

It is an amenable number.

660716017 is a deficient number, since it is larger than the sum of its proper divisors (50824323).

660716017 is a wasteful number, since it uses less digits than its factorization.

660716017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50824322.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 660716017 is about 25704.3968417856. The cubic root of 660716017 is about 870.9735070853.

The spelling of 660716017 in words is "six hundred sixty million, seven hundred sixteen thousand, seventeen".