660115665609 has 8 divisors (see below), whose sum is σ = 880168591680. Its totient is φ = 440069924976.

The previous prime is 660115665577. The next prime is 660115665613. The reversal of 660115665609 is 906566511066.

It is a happy number.

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

It is not a de Polignac number, because 660115665609 - 2⁵ = 660115665577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660115665619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578214 + ... + 1952175.

It is an arithmetic number, because the mean of its divisors is an integer number (110021073960).

Almost surely, 2^660115665609 is an apocalyptic number.

It is an amenable number.

660115665609 is a deficient number, since it is larger than the sum of its proper divisors (220052926071).

660115665609 is a wasteful number, since it uses less digits than its factorization.

660115665609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592719.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The spelling of 660115665609 in words is "six hundred sixty billion, one hundred fifteen million, six hundred sixty-five thousand, six hundred nine".